Andy, I think the RME Fireface 800 is a very good choice myself. It has received many good positive reviews online. It records and plays back at 24 bit 192kHz plus it has many other advanced features.

The cheapest I've been able to find it for is $1,449 at zzounds.com or musiciansfriend.com. Also, 8thstreet.com has it for the same price also. You might be able to find it cheaper by going a Google search.

Best regards,
Mike
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Yamaha Genos, Mackie HR824 MKII Studio Monitors, Mackie 1202 VLZ Pro Mixer (made in USA), Cakewalk Sonar Platinum, Shure SM58 vocal mic.