you could probably get an m-audio 2496 which is pretty good as far as A/D converters go and there isn't much latency since it is ASIO and doesnt use USB or firewire.
i use a delta 1010 for my PC setup through a mackie 24-8 and it works great. you will have to worrk about mics though since pre-amps going into the card are much better than the onboard/inline stuff. that, and you dont have to worry about gain messsing up your mix...