Radeon HD 7660D Crossfired with Radeon HD 6670 VS GTX 650 Ti

[grich96]

I was wondering whether should crossfire my Radeon HD 7660D (which comes with the AMD Quad Core 3.8 ghz proccessor) with a GIGABYTE GV-R667D3-1GI Radeon HD 6670 1GB 128-bit DDR3 PCI Express 2.1 x16 HDCP Ready Video Card, or get a EVGA 01G-P4-3650-KR GeForce GTX 650 Ti 1GB 128-bit GDDR5 PCI Express 3.0 x16 HDCP Ready Video Card. I will be using my PC with Windows 8. (most likely) I will use it for a medium amount of gaming, internet, and some music listening. I know the GTX 650 ti is superior to the other two video cards alone but i was wondering if the combined power of the other two is more than that of the GTX 650 ti.

Note: This would be my first build.
My power supply is crossfire ready.

 

[ASHISH65]

Get gtx 650ti much better than that crossfire.

 

[Glory0]

What if it was crossfired with a sapphire hd 6670 gddr5 would that be a "ok" graphics setup?