AMD Phenom II X4 955 Black Edition, Core 2 Quad Q6650, i7 920

I'm thinking about build my first computer, this computer will be for gaming, so I want the opinion of people about it.

I don't really care if it is AMD, or Intel, i just care if it is a good processor and if does what I want it to do.

My options by what I was looking are:
-(1)AMD Phenom II X4 955 Black Edition
http://www.newegg.com/Product/Prod [...] 6819103674
-(2)Intel Core 2 Quad 6650
http://www.newegg.com/Product/Prod [...] 6819115130
-(3)Intel i7 920
http://www.newegg.com/Product/Prod [...] k=i7%20920
or at my last option a (4)Intel Core 2 Duo E8500(http://www.newegg.com/Product/Product.aspx?Item=N82E16819115036)or if there is another cpu that it can also be good for games but about the price of $300 or lower let me know!
I want to overclock it so, answer me saying each motherboard should I get!=D

for the (1) I was thinking about the ASUS M4N82 Deluxe AM3/AM2+/AM2 NVIDIA nForce 980a SLI AMD Motherboard
http://www.newegg.com/Product/Prod [...] 6813131383
for the (2) and (4) I was looking at the
GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard
http://www.newegg.com/Product/Prod [...] 6813128358
FOR THE (3) I don't know

should I get a better cooling for the cpu, or the one that came with it can handle that and the overlock for about 3.8ghz,4ghz, or something like that?

besides that my computer would be

-Antec Nine Hundred "http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021"
- 750 GB SATA Hard Drive "http://www.newegg.com/Product/Product.aspx?Item=N82E16822136359"
-Saphire ATI 1GL Radeon HD 4870 1GB 256-bit GDDR5 "http://www.newegg.com/Product/Product.aspx?Item=N82E16814102801"
-CORSAIR CMPSU-750TX 750W ATX12V "http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006"
-HP Black 22X DVD+R 12X DVD-RAM SATA 22X Multiformal DVD Writer"http://www.newegg.com/Product/Product.aspx?Item=N82E16827140040"
-G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 http://www.newegg.com/Product/Prod [...] 034;"

If you want to say about the others components of the computer, because I just want to build a really good computer, so if there is something wrong or that could be better, in the same average of price let me know too

thank you for all of you to take the time to read that=D

this computer will be for gaming, it's in the first sentence!

Thank you for your opinion it can helps me!!=D, and what about the other components of the computer, are those like all compatible, and also good for games, do you thing for overcloking the X4 I should get a better cooling for it??

just one more thing do you think that I should get a better cooler for the processor or the one that comes the processor is good enough to get the processor running cool with the overclock???

And once more, thanks for the help here=D

ok, thanks I'll buy it also!

What's the difference between the 940 and the 955, besides the stock clock speed?that the difference is just of 0.2ghz

besides the socket is there any other difference??
yeah, that's my last question, thank you for your help^^=D

955 has both ddr2 & ddr3 memory controller, 940 only has ddr2. ddr2 or ddr3 makes very nominal performance difference.

The multiplier's are unlocked on both chips. All you need to do is change it on the 940 and it'll run the same speed as the 955

He said it was for gaming, so the ddr3 or ddr2 shouldn't make much of a difference.

If you building from a scratch, go with I7920 , cheapest board & 6GB ram you could find.

Gigabyte x58 mb & patriot ddr3 1600 ram doesn't work together... I've tried...

Actually I would and did go with the udp5. http://www.newegg.com/Product/Prod [...] 6813128391 both pci-e run 16x the amd 940 or 955 will run and I'm using 8 gb corsair 1066 and 2 4870 toxics http://www.newegg.com/Product/Prod [...] 6814102815 And The CM V8 cooler. http://www.newegg.com/Product/Prod [...] 6835103055 This setup has been a monster