Not pooh-poohing your choice. The 9800GT is a very solid card, one of the best variants of the 8800GT you can get (I don't count the GT1xx series). It's like the TNT2 of the modern age, meaning that it is usually the card that game designers target as their "minimum system requirement" these days, but NVIDIA has already declared the Geforce 6xxx and 7xxx series as EOL, and I can't think the 8xxx/9xxx are that far behind, especially now that Redmond is pushing Win8 so intently.
--Patrick