GPU or CPU?

Okay so I'm ready for a upgrade, and I'm not sure If I shold upgrade my CPU or my GPU? Specs are here:

http://ghost4k.blogspot.com/2009/02/first-blogmy-pc-specs.html

I wan't greater performance in games, specifically the Total War series, and other RTS games. Any advice? (Let's say budget is 200 USD)

If you play RTS, get a better CPU, that GPU should be fine for a while.

Get a rocking CPU, then upgrade the GPU when the time comes. Either that or you could wait and just get a new computer.Luminouslight

Any opinions on this one?

http://www.newegg.com/Product/Product.aspx?Item=N82E16819103471

Also, how much of a performance boost could I expect?

get a quadcore and you will be a happy camper, games like dragon age origins, crysis and gtaIV... still a cpu hog

I play DA:O just fine on my Dual Core... :) but never tried GTAIV or Crysis. I know Saints Row 2 lags on my PC. So you think that Quad core I posted is the way to go?

One final Question, does anyone think my PSU will be an issue with the above CPU? If everything checks out then I will be buy this by the end of tommorrow.

no it won't be a issue you just need a new motherboard and DDR3 since it socket am3 unless that mobo is am2+/am3 ready

Why would I need a new Mobo? The CPU says Socket type is AM2+, my Mobo is AM2+.

http://www.newegg.com/Product/Product.aspx?Item=N82E16819103471

oh yeah forgot Phenom II X4 940 is Am2+ while Phenom II X4 945 & Phenom II X2 550 & Phenom II X3 720 that is am3 : ah now i remember Phenom II X4 940 come in two Varient am2+ & am3 Tough i don't know how much dif is there in them beside TDP and better OC and higher mhz stock for the 945's

AMD Phenom II X4 940 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM2+ 125W Quad-Core Black Edition Processor - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103696&cm_re=amd_phenom_ii_x4_945-_-19-103-696-_-Product (Am3)

That's a great upgrade. You will notice the difference. Good choice!