Which is the best from Core i3 Core i5 Core i7 Core i9?

[Hardwareman]

Which is the best from Core i3 Core i5 Core i7 Core i9? Which processor is powerful and which one is the best according to you? I have put up some information on all these processors below :

Core i3 :

Clarkdale is the code name for an Intel processor, initially sold as desktop Intel Core i5 and Core i3 and Pentium. It is closely related to the mobile Arrandale processor; both use dual-core dies based on the 32 nm Westmere version of the Nehalem microarchitecture and have integrated Graphics as well as PCI Express and DMI links.

Core i5 :
Core i5 is a brand name used by Intel for several new processors. It is positioned between the mid-range Core i3 and Core 2 and the high-end Core i7 and Xeon brands. On September 8, 2009, Intel released the first Core i5 processor: The Core i5 750, which is a 2.66 GHz quad-core Lynnfield processor with Hyper-threading disabled. Lynnfield Core i5 processors have an 8 MB L3 cache, a DMI bus running at 2.5 GT/s and support for dual-channel DDR3-800/1066/1333 memory. The same processors with different sets of features (Hyper-Threading and other clock frequencies) enabled are sold as Core i7-8xx and Xeon 3400-series processors, which should not be confused with high-end Core i7-9xx and Xeon 3500-series processors based on Bloomfield.

[Hardwareman]

Core i7 :
Intel Core i7 is Intel's brand name for several families of desktop and laptop 64-bit x86-64 processors using the Intel Nehalem microarchitecture. It is a successor to the Intel Core 2 brand. The Core i7 identifier applies to the initial family of processors codenamed Bloomfield introduced in 2008 and the 2009 Lynnfield and Clarksfield models. All current models are quad-core processors, but the upcoming Gulftown Core i7-9x0X Extreme processor will have six hyperthreaded cores. Intel representatives state that the moniker Core i7 is meant to help consumers decide which processor to purchase as the newer Nehalem-based products are released in the future. The name continues the use of the Intel Core brand. Core i7, first assembled in Costa Rica,was officially launched on November 17, 2008 and is manufactured in Arizona, New Mexico and Oregon, though the Oregon (PTD, Fab D1D) plant has already moved to the next generation 32 nm process.

Core i9
This processor is not yet out, but its rumored to be leaked and some guy sold it on eBay. Now i have no more info on this except that is a processor with 6 cores and its code name is Westmere Gulftown. Lets wait for this one now.