Dont think youll see much increase in FPS with a new card. Im running pretty much the same system as you.
PIII 750
Gforce2 MX400 64meg
512k ram
I took some FPS hits as well with 1.08. But i can still fly without to many problems.
Was running AH on a test system p166 and a 4meg virge video card in beta gettin 1 to 3 FSP, still had no problem killin.
I am using this system for wwiionline as well and i have very few problems there, and that program is a system resource hog. I dont think i will upgrade for another year.
So, if you think your up for an update and have the money to do so, CPU & Video card will be needed. If you can still fly and get kills, leave it for now. Prices are dropping fast on parts so i would hold off on upgrades.
Dog out.......