If you have Reason and Rewire, you can actually use Reason's reverb tools, which are actually fitted into a virtual rack. The reverb is surprisingly smooth and rich, as well as inexpensive, especially considering all the other goodies (delays, chorus, distortion units, all very flexible) that come with Reason.
Pitch changing in Cubase is quite powerful, so I'm at a loss why you wouldn't prefer to use that. Can't make any other recommendations there, sorry.