Need help/feedback with gaming build

[nn010385]

I'm thinking of buying the current gaming "budget build" and I'd appreciate any help I can get. Keep in mind I already have an AMD Radeon 6770 and a 21" Acer monitor.

Hitachi 750GB HDD: http://www.newegg.com/Product/Product.aspx?Item=N82E16822145532
G.Skill Ripjaws 8GB RAM: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314
Z68 Motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E16813128502
i5 2500K: http://www.newegg.com/Product/Product.aspx?Item=N82E16819115072
Case and 630W PSU Combo: http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.767661

Does this all come together in a logical way? I'm not the smartest when it comes to computers. Also, should I even bother with this SDD thing? I was thinking of using a Crucial M4 64GB SDD for my OS but now I'm thinking I shouldn't even bother.

 

[patapat]

Do you have a budget? Also, what are your current specs, are you replacing old parts? It would help to know what you're replacing so we can help determine if something is, or isn't worth upgrading.

 

[nn010385]

This would be a completely new system. And I'd like to keep it under $700 if at all possible. Like I mentioned, I already have a monitor, a video card (brand new), and peripherals (mouse, keyboard, etc) as well as Windows 7 64-bit.

 

[nn010385]

Uh, current specs...
Q6600
ATI 4870
4GB Corsair RAM
Some Gigabyte motherboard (P45, I think)
640GB HDD
650W PSU