Which processor should I buy?

My PC needs an upgrade. I've narrowed it down to two processors but i need your help deciding which one to buy. 
 
AMD Athlon II 2.9 GHz Quad Core   
AMD Phenom II 3.0 GHz Quad Core
Intel Core 2 Quad 2.5 GHz Quad Core (Q8300) 
 
Speedy answer is appreciated.

Obviously enought. AMD Phenom II.

 
I don't have an answer but I'm interested in what most people think is the best as well.

Phenom easy. What number is that?  The 955?

phenom ii 1055t 6 core one.

" @GuttlessCashew: I'm getting a new motherboard with the processor because my current is an old LGA775 but it doesn't support Core 2 technology and I can't find a BIOS update for it. 
@TheHBK: 940. The 955 is 3.2 GHz but is a little bit more than I'm willing to pay.   I'll go with the Phenom. Thanks for the replies people. "

Yeah Phenom is probably your best bet :)

There is some six core amd processor, not sure if it's compatible, I haven't really researched the socket because I seriously don't care. However it's good to throw out options out there as a suggestion.

I recently purchased a Phenom II that I really like, but your biggest issue is going to be motherboard compatibility. Make sure that you avoid the 940 model as it works with very few motherboards, while the 945 works with almost anything.