I currently use an old Adaptec 2940UW in my system (hey, it was free) but I wholeheartedly recommend Tekram cards if you're shopping for one. Adaptec cards tend to cost 1.5-2x as much and they really don't have a particular edge in performance.
I used to have a DC-315U (which was a simple, but very stable card), but I had to swap it out with this Adaptec for my CD drives because I needed a card with a boot BIOS.