what should i upgrade on my computer

Really I think that you should keep what you have and save up more money to build a new system when either Intel's Nehalem or AMD's Deneb comes out in a few months time.One thing that you will enjoy is the smoothness in gameplay with an Integrated Memory Controller in addition to being able to have higher frame rates with these upcoming CPU's.In addition when running in 1920 X 1200 resolution you will probably want a more powerful graphics card with at least 1 GB of video memory (2 GB will be better) like the ATI Radeon 2 GB DDR5 version of the 4870 X2 coming out next month.4 Gigabytes of video memory would only be needed at much higher resolution so for your monitor it would be overkill and show no real improvement.

Yes,more games will take advantage of 4 core CPU's in the future.
Some currently already are like Microsoft Flight Simulator X and Supreme Commander.FSX can already use many more cores than 4 right now.

You'd need a new mobo for DDR3 aswell, and to be honest you want notice much of a diff with it over DDR2 i think.

I'd OC that CPU to around 3Ghz and invest in some cooling for the CPU and the NB. And buy a new GFX card like a 9800GTX+ or the 260 if you can stretch that far, as you can go Sli with those later if you want because buying Ati you wouldnt b able to do crossfire on your mobo.

As for more RAM as some1 has suggested that depends on what OS your running if your running 32bit might aswell not bother, if you've got 64bit go for it.

Also you might wanna get 2*2Gb memory sticks, as i've got the P5N-E Sli and my mobo doesnt like all 4 memory banks filled up. Though mine is a 650 chipset and yours a 680 you still might wanna try searching for info on that. In my case having all 4 memory banks filled limits for far i can OC.

Thats why i have 2*2Gb DDR800 G.Skills on there way to me 2morrow so i can get my OC back up too 3.23Ghz

I would choose a new video card first.
Another 2 gig of memory would be my second choice.

ddr 3 sucks so bad right now...

but as soon as nehalem comes out that should all change... then you'll have tril channel memory... and you'lll eliminate the FSB so the cpu should be able to use all of the rams speed instead of just like 800 mhz of the 1333 - 2000 mhz available

i say you use your 200-300 bucks and go out to a massage parlor

haha jk.

ur system is fine. i agree w/dirt. (i always do for some reason) O_O

aitei guess i ll just w8 another year or so before i upgrade.. i ve pushed my cpu to 3ghz before and i hardly notice a difference in any game i played.. right now i think most my games are limitied by my gpu rather than cpu, but then again i can always be wrong.. anyways i guess i ll just w8 it out it bump my overclocks a tad with better cooling

well from 2.33 ghz to 3.1ghz i noticed about 1 or 2 fps difference at 1920 x 1200 in crysis.. i guess its still cool for more free horsepower an what not.