Best desk mount monitor arm for iMac 27"

Hey guys I have recently bought iMac 27" and I am just loving it. I am not having any problem with the same but I am looking out for the Best desk mount monitor arm for it as I don’t want to use it on some table for something, I have checked out for the same and have come across a no of options but I just want to get the best one especially for iMac 27". Anyone using a desk mount monitor arm can also share their experience or suggest me a better choice. Thanks in advance.

I think that the “iLift Apple Cinema Display and iMac Mount” will be the best option for you and I am sure that many will be suggesting you the same further.
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The features of “iLift Apple Cinema Display and iMac Mount” are as followed:

• It comes with FLEXmount 6 mounting options
• The height, pivot and tilt are quite easy to adjust and the monitor will just float weightlessly
• The arm can be extended up to 27 which will be the best fit for iMac 27"
• It can be folded up to 3'' of space
• It can be tilted up to 200 degrees because of its Monitor tilter mechanism.
• Its Cable management is capable of keeping the cable tucked beneath arm and it appears quite neat.
• You get VESA-monitor compatible - 75mm & 100mm VESA with this deal.
• It is compatible with 20 & 23-inch Cinema Displays select 7517-1000, 17 & 20-inch iMac G5 select 7517-1000, 27-inch Cinema Displays select 7517-1500, 30-inch Cinema Displays select 7517-1500

If at all you don’t like the iLift or if it is out of your budget then you can check out “Ergotron 45-214-026 MX Desk Mount LCD Arm “ and you can get it for half price as that of the iLift:
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The features of the Ergotron 45-214-026 MX Desk Mount LCD Arm are as followed:

• It is capable of handling mid-size displays weighing up to 30 lbs (13.6 kg) easily.
• It can just Position the iMac in most of the directions for providing comfort to eye, neck and back strain.
• This Pre-assembled arm just offers monitor/TV theft deterrence
• You can also rotate the screen in portrait mode for seeing photos and pages.
• It can be extended up to to 16.7" (424 mm), it has a Patented CF motion technology for simple installation and Easy-to-use

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Technical specification:

• Supports LCD size: Up to 30 in./76.2 c
• Supports LCD weight: 14 to 30 lbs./6.3 to 13.6 kg
• Lift: 5 in./13.0 cm
• Tilt: 75 degrees
• Pan: 180 degrees
• Rotation: 90 degrees P/L (portrait mode incompatible with 30-in. display
• Mounting standards: VESA FDMI, MIS-D, 75/100, C

You can check out “SAA2415 MONITOR ARM” as well, you can get it for $336.87. This will be costing you around iLift but I think that this Heavy-Duty Arm with Wall Mount Kit D will be a better choice. You can say that it is one of the toughest and attractive LCD monitor arm, you can make that out form the bellow image of it. It can handle LCD monitors, LED displays, touch screens, flat screen TV weighing up to 62 pounds. Since you are getting it for your imac I think that you will be just able to float the same on your fingertip, the other feature of SAA2415 Monitor Arm is as followed:
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• It can rotate the screen from landscape to portrait and can be stretched up to 22 inches horizontally and 14.5 inches vertically when unobstructed.
• It can float 62 pounds of LCD monitors effortlessly.
• It is said to be Ideal for iMacs, Wacom Tablets and panel PCs.
• It is capable of handling all in One PCs and Touch screens and can be mounted to walls, desks, poles, cubes, slat walls etc, you can also get Horizontal linear tracking mounts.

Bretford MobilePro Desk Mount looks nice as well.
http://i45.tinypic.com/2yulx8w.jpg
The other details of the Bretford MobilePro Desk Mount are as followed:

• It can handle Cinema Display or iMac that accepts a VESA adapter bracket and weighs 31 lbs./14.1 kg or less, it comes with 12-year warranty and acts as a tension free adjustment system providing the best safety and support.
• Dimension
  Weight: 9.0 lb./4.2 kg
  LxWxH: Vertical lift adjustment: 16.0 in./40.6 cm; Tilt: 90 degrees; Pan: 180 degrees; Rotation: 360 degrees portrait/landscape
  Compatibility
  24-inch LED Cinema Display, 24-inch iMac, 27-inch iMac: requires Apple VESA Mount Adapter Kit (Apple Part No.: MC434ZM/A); 30-inch Cinema Display: requires Apple Cinema Display VESA Mount Adapter Kit (Apple Part No.: M9649G/A)

I think that MD115 Full-Motion Desk Mount from Sanus can be a good option as well. It can handle monitors up to 30" and can also find the right viewing angle with its 15" extension arm. Its height is adjustable and it comes with Innovative clamp that can be attached to desk or cable hole. It has a hinged arm for adding range of motion and hanging up tv perfectly. Its Large VESA TV brackets fit 200 x 200, 200 x 100 and 100 x 100 where as small VESA TV bracket fits 100 x 100 and 75 x 75. One gets extreme rigidity and high-tech look with its Extruded aluminum construction. It has a Cup-shaped faceplate design for providing fluid motion in every direction and Built-in wire management system for protecting the cables and keeping them intact.
Technical specification:

• Max Equipment Size- Up to 30"
• Adjustments- Tilt: ±15°,Swivel: ±15deg,Roll: ±180°,Height: 5" (13cm)
• Post Length- 18.25" (46.36cm)
• Base Dimensions- 11.25 x 6.75" (28.58 x 17.15cm)
• Weight Capacity- 35 lbs (15.91kg)
• Mounting Hole- VESA 100 x 100 VESA 200 x 100 ,VESA 75 x 75 ,VESA 100 x 200 ,VESA 200 x 200 ,VESA 200 x 200