I'd go with an arranger keyboard instead. Drum machines are good, but you aren't likely to find any that has a good modern sound, I can't even recall if there are any made after 1990. I'd go with something along the lines of Korg Pa800, it's a bit on the expensive side, but if you're into performing music, you wont regret buying it.
Actually after a bit of googling, I found this: http://www.bossus.com/gear/productdetails.php?ProductId=473
I've read about it, it's pretty good, it has pedal connectors, effect inserts etc, but you can't import wave or mp3 in that. It's cheaper than the Korg arranger, but still a bit on the expensive side imo.