I love the MAudio Axiom PRO 61 with HyperControl using now, but on ebay you could nab either a 25 key Novation X-Station OR XIO-Station...they may be a little older but both of which act as a midi AND audio interface, extensive midi control, not to mention there's a very usable 3 osc/8 and 12 voice synth in there, both also have mic pre-amps and seperate external inputs. Have seen them for less than a few hundred usd and they key action is good with velocity/aftertouch!