I'm thinking of selling my Electro Harmonix cathedral reverb, thought i'd give you chaps the first shout.
It has 2 different spring verbs, hall, room, plate, reverse, echo and flerb (modulated reverb)
You can save a setting in each of the different reverb types and if you hold down one of the buttons you get infinite reverb.
It's a powerful unit in a stompbox, ideal if you have an amp with no, or not nice, reverb.
http://www.ehx.com/products/cathedral£100 ono