My Focusrite Scarlett 18i20 is incredibly versatile as both an audio interface and can operate in standalone mode without computer as a mixer as well. Lots of ins/outs, ADAT, clock sync, USB, MIDI, individual level controls on front, dual headphone, and the Scarlett Mix Control allows for multitude of possibilities. Around $500. USD. Very good converters.
With that said, I too use a few rack mixers as summing mixers because I do not use vst anything–all hardware keyboard synth set-up as well as racked FX units so I can control my FX send/receive on various synths before going into interface and then Reaper.
Focusrite also just came out with a brother of it in the Sapphire Firewire/Lightening nexus as well.

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