I bought the Corsair K65 RGB (red cherry switches) keyboard from Best Buy but had to immediately return it to get the Razer Blackwidow Chroma and here is why.
Corsair K65 RGB requires 2 USB ports to function, requires drivers for even the keystrokes to work, only supports Windows. (also, does not do usb pass-though to a Windows VM).
The Razer Blackwidow Chroma only requires one usb port to fully function, is usable in my bios, doesn't hang up my computer when it posts, keystrokes work without a special driver install and my only actual requirement the keystrokes work with Linux out of the box (I have to use Linux for work). To get it to work with Linux I program it using Razers software within a Windows VM using VirtualBox's usb settings and when I turn off my VM and use the keyboard in Linux the LED setting don't change. Even if I unplug it for an extended amount of time the settings say on the keyboard.
As for Razers new "Green" Switches I like them a lot. They are easier to click then the Cherry blue switches, slightly quieter, just as satisfying. Because I'm using mine at work I'll probably get o-rings to make mine silent. (Linux tech support)
Before you purchase, Id highly recommend going to Best Buy and trying them both out because the Razer Blackwidow Chroma with their green switches and Corsair K65 RGB with Cherry Red switches are on display there.
(FYI, K65 IS 10 KEYLESS)