My opinion is that buying anything right now is quite a wrong choice. GTX 200 series have been discontinued so prices will only rise now due to lack of supply. Furthermore, $250 is within spitting range of HD5850s (around $280~300) which with the latest driver updates seem to perform much better and seems to usually be a bit faster than GTX275/285s. Lower power consumption as well DX11 make it a more attractive buy for just a little bit more. I seriously would suggest you hold out with your 9800GTX+ which should be enough for most games as of now. You should wait for Fermi and then decide for a new card. If you really want to upgrade, check out the latest AMD cards as they offer quite a number of advantages over the now EOL GTX200 series.