What card should I go with?

Hey I want to build a new gaming rig and am wonder for around $350 with a little room to stretch what Graphics card would give me the best performance and quality. This is the rig it would be going into http://www.tigerdirect.ca/applicat [...] =B69-1054.

Right now I am considering a few cards.
1.4890 and add another one in the near future
2.GTX 280
3.Two 9800gtx's in SLI. add another later on and have 3 in sli
4.GTX 275

The card would be running at 1680x1080 for resolution the goal is to get maximum performance but also with good quality. I would also like to hear suggestions of other cards and manufacturers.

The GTX280 is too expensive for its performance.
The 9800 route is a waste, even in tri-SLI it wo n`t tax your i7 CPU.
The HD4870 (1Gb) or GTX260 is the minimum single card I`d suggest but sourcing a second at a reasonable price in a years time might prove difficult.
For price/performance it has to be the HD4890 but bear in mind this card can be noisy under load.
I`d say, given what I`ve already written, is get the GTX275 and SLI later if need be, it`s quieter than the HD4890 and is slightly faster.

Ya I do like the idea of the GTX 275 but the core and memory frequencys on the 4890 are a decent amount higher and has more potential for overclocking