it’s a solid system. you won’t regret the purchase.
the RAM is a bit overkill if you don’t plan to overclock anything, because any PC2-5300 (DDR2-667) 4GB kit would suffice.
but if you want to use the headroom the RAM gives you, i’d change a few components which have proven to be the choice for raising the frequency on a core2quad:
Gigabyte EP45 Extreme
it’s the absolute “king” when it comes to overclocking a core2quad. 520mhz and beyond on the FSB are not seldom seen, if the rest of the components allows it. with a q9550, an FSB of 520 would already result in a whopping 4420mhz.
if you don’t wanna compromise, go for this puppy. the BIOS is also pretty straight forward and not too complicated, feature wise.
price: aprx. 160 EUR
DFI LANparty DK P45-T2RS Plus
the “plus” is important here. i own this board. i got it because it’s cheaper than the EP45 extreme and is able to achieve almost the same (very high) clocks on quads, even though it “only” has a four-phase PWM (as opposed to a 12-phase PWM of the EP45 Extr.) the BIOS is extremely feature-rich and allows the control for options even experienced users most probably have never heard of before. getting your OC stable on this board will usually involve more “work” in terms of testing and tweaking, but if you’re patient and have the will to dig a bit deeper into the materia, it will let you get there, even though FSB clocks above 500mhz are pretty seldom here.
price: aprx. 110 EUR
do yourself a favour and get the Scythe Mugen 2, no matter if you have OC in mind or not.
you might want to replace the stock fan. yate-loon is recommended for that case.
price: aprx. 35 EUR
just make sure you buy a Q9550 E0. they’re newer and have some “fixes” to the core. besides that they tend to overclock way better than its C1 predecessors.
price: a few bucks more than the C1 revision.
… of your system looks fine imo. i’m not that much into gaming and at the seldom times i play something (i’m at a res. of 1920x1200) my almost 3 year old 8800GTS 640MB suffices easily, so i know i’d be damn happy with your GTX260
you didn’t mention the PSU you were buying.
a lot of enthusiasts are swearing on the enermax modu82+ series and so am i. i got the 620W model which is terribly silent and highly efficient. the modular cable routing comes in handy if you want a clean cable management inside your case.
if you do not want to overclock (which would be a pitty, because your CPU is capable to do so much more than the stock 2.83Ghz), then forget the motherboard and CPU suggestions and just stick with what you already have. the zalman cooler is of course also sufficient then…