As long as you're still running Windows XP, any of the Soundblaster cards work wonders. Creative has always been really bad on drivers, they still have problems with the nForce 4 chipset on motherboards and have bad Vista support at the moment.
If you're an audiophile, I'd look at any of the Audigy ZS2 or X-FI cards, 24bit sampling makes a difference.
Otherwise, if you mainly use it for Aces High and just the mic, any Soundblaster card in your budget will do fine.