If you want to carry over the card to a newer board and CPU latter on, then it may be worth it to spend a little more on the GTX 275. Of course by then DX11 will be out. If you're just gonna build a new rig latter on and don't even want to overclock, then you may as well save money and just go with the 260.
yeh you may want to OC that a lil... its a good overclocker, u shouldn't have much problem... for the $200, go with a 260... and concernign DX11, you won't have to worry about it for over a year, but by then you may want to upgrade your card again.
Your PSU matches the requirements for a GTX275, both in Watts and amps on the +12v rails so it's fine.
Allow about 10.5" for the cards (yes they are that big).
For such a large resolution I would advise a GTX275, but if you have to sell body parts for it the GTX260 will drive that monitor well, although you'll have to turn a few details down and keep the AA limited.
With a SLI MB, the Nvidia choice makes the most sense which is why I've not mentioned ATI: One card leaves the SLI route open when, or if, you choose to upgrade later.
As for cards: Do n't pay much for a factory overclocked card, get a normal one and do it yourself! If your case lacks industrial fans or is smaller than a shed, get a card with a cooler that exhausts out of the case. In the USA XFX, EVGA and BFG have the best warranties and customer support.
Get a total of 4Gb of RAM: You know it makes sense;)
A X16 PCI-E 1.0 or 1.1 slot will not restrict even a GTX275 in any way at all, not even the tinyest little bit!
Oh okay. Just so I'm clear about the PSU stuff (and again, thanks for putting up with my noob questions) - when the video card says it needs a 12v of xxA, the xx is the combined amps of the two 12v rails? so if each is 20A, I can use a card that calls for up to 40A?
Thanks. A little technical for me, but interesting. I'm now more confused than ever, unfortunately lol.
I just want to know which card I should buy for my system - 260, 250, 9800gtx+?
Newegg doesn't ship to Canada, so it should be a card (BFG, EVGA) that I can get in a shop here. Will my current 650 psu be good enough for any 260?
Of course I'm not suggesting you just shop there, it's just anoter site to look through for a bargain;)
The PSU label says it matches the inflated Nvidia requirements but if you prefer to play it a little safer, stick to the reference speeds rather than going for an overclocked card.