Cheapo Gaming Upgrade Advice

[ladic]

Ok want to upgrade an older gaming pc, but I'm on a budget.
Reso that I will play in is 1680x1050
Already have OS just need a few parts.
No Overcloking
My idea is to stay below $250 on the 3 pieces I need.

Current Build:

CPU: C2D 4400 (2ghz)
MoBo: Gigabyte (cant remember model)
Ram: 3gb ddr2 (2gb 800 and 1gb 667)
Video: Nvidia 880gts 320mb


Parts I can reuse:

Case: Coolermaster
PSU: OCZ StealthXStream OCZ700SXS 700W
Video: Radeon 4870 512mb (I have this card already)
hardrive, dvd drives, etc

What I need to Buy:

CPU, Ram and Motherboard


So Far I was thinking the following parts:

CPU:AMD Athlon II X3 445 Rana 3.1GHz $74
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103872

MoBo: ASUS M4A79XTD EVO AM3 AMD 790X $84
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131402

Ram: CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 $70
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145260

Total: $228 + shipping

Ok so would this give me a noticeable improvement in gaming over the old build?
Is this the best I can do for under $250?

 

[ladic]

Problem is, Video Card I already have

 

[ladic]

I ended up going with this

http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.547260

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145218