Esh....Im using a Roland A37 http://www.rolandus.com/products/details.asp?CatID=8&SubCatID=38&ProdID=A-37

with the great sounds of the Ketron Midjay and Im having a ball...it sounds Great and the flexability of playing Styles/Mp3's/Smf/Wav/SFX/Lyrics, Vocals & Harmony all in realtime seperatly or together controlled with sliders in an 8 Lb module & a controller keyboard via Midi is an awesome combination all interacted via USB ......

Good Luck it will fit you nicly!!