Tony,
I would not waste my money on one of the harmonizers, if you're not going to use the harmonies. There are several great reverb units including TC Helicons G Force or the less expensive G major.

I have a G Force and it has some great reverbs on it.

Also if you do want one of the harmonizers I chose the VW over the Prism for a couple of reasons. Later voice modeling technology and easier to use.

You could also look at the digitech some of the other members here use it and like it, it's less expensive.
Terry

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jam on,
Terry http://imjazzed.homestead.com/Index.html