If you are looking for a great clean reverb that doesnt suck you signal, you'd probably want a true spring reverb. Most pedals and lower cost reverbs are digital, which I don't care for. Some people don't notice or care...it's you choice.
Try the fender tank....I got my reissue for $260 @ GC. Run it in your effects loop for minimalized tone sucking. Well worth the dough if you want clean reverb!