I recently had the same question. Three modules were up for consideration. - The new Korg ESI Electribe Rhythm Production Sampler Never played with it but I don't think it has ROM sounds. http://www.korg.com/gear/
- The Roland SP808. Pricey, but it does it all. The D-Beam controller is dope. http://www.rolandus.com/PRODUCTS/MI/MI_GRP.HTM#SP-808 - Ensonique ASR Pro. Picked one up used and am very happy with everything but sampling length. http://www.emu.com/products/asrx_pro/asrx_pro.html Good luck. Miles