Sound cards are limiting. They are not portable.
External USB/Firewire devices can be had for the same price point.
Most will supply phantom power for mics.
Tascams and mboxes will do this.
Define what you want out of multi track.
Record a band with playing together with each audio source going to a separate track or record instruments/voices one or two at a time with each going to a separate track that you assemble later?
If the later then something from here should fit the bill
http://www.sweetwater.com/c683--FireWire_Audio_Interfaces
http://www.sweetwater.com/c695--USB_Audio_Interfaces
The Tascam and mBox stuff (as well as the others) will come with Steinberg CuBase, Pro Tools Lite or something comparable.