Hi Mark,
I've used the Nanoverb 1 that was built in to a small club sound system, and it sounded terrific, especially for the price, anywhere from $79-99. Alesis & others do have other units for similar prices that may give much more flexibility, tho. While the Nanoverb is mono/stereo in & stereo out, the reverbs are strictly mono. They sound spacious (I had a favorite or two), but the stereo kicks in with some of the chorus & flanging effects. There's no readout to easily show you your setting - you have to look at the knobs to see it - which you'd likely find in a bigger unit, & may eventually find useful.
But if your just looking for a little "space" for your 'tron, & probably not going to "foolaround" too much with it, ANY Alesis unit, including the Nano, will do a FINE job. Have FUN!
Cheers!