hi, i'm looking for a good card for my PC. my son will use it to play flight sim x. at the moment its running pretty slow with fsx, but its usable. the specs are;

P4 3.2ghz socket 478- foxconn m/b 865A01 with 8x agp- DDR400 ram 512 mb- XP home- old graphics card.

i'm going tp upgrade the ram to 2 or 3 gb, but i'm not sure which card to go for.

thanks for any help...