I don't know that you'll get a good reverb tone out of the DE7, but it's a great dealy pedal for the money. I like the "echo" setting, which cuts some of the highs for a simulated analog tone...to me this sounds warmer and more pleasing than to Boss, although the Boss could probably be modded. I'd pick one up used, or buy a total of two Tone Lok series spedals and get one of those nifty pedal boards for free from Ibanez.
http://www.ibanez.com/intro.asp#
Offer ends July 31 (plug for the mother company

)
Greg
PS- If you are looking for a
reverb pedal, the Boss RV-2 is nice. The RV-3 has both delay and verb, but is less flexible than separates.