I use an Echo Gina - got it not too long ago. Sounds great. Pretty good deal that it comes with adat (even though I have yet to get a digital mixer), but I understand what seraph is saying about PCI based cards.
I am only using the oem cubasis that came with the sound card, but I have yet to figure out how to assign different audio outputs to different audio channels. Each of the outs work, but only one at a time with cubasis. Is this a limitation of the oem version or am I doing something wrong?
http://www.echoaudio.com/Products/Gina24/index.php