I tried to get used to the framerates, and I tried to convince myself to NEVER buy any upgrades for videogame purposes, but who am I kidding? I just can't enjoy the sim 100% if I'm getting such awful frames. So I have to bite the bullet and buy a new card...
Now, most people have recommended a 7800GS for me (since I have an AGP computer). I've found that there are two different 7800GS's: an eVGA one and BFG Tech one. The eVGA one is MUCH more expensive (I'm assuming it's better).
I only want a card that will allow me to run FS9 (not FSX) at peak settings with at least 20 FPS. Would the less-expensive BFG Tech one be enough, or should I spring for the