Here's a few tracks that I learned feature the viola:
The Cure – Namata, To Wish Impossible Things
The Velvet Underground – Venus in Furs, Heroin, Sunday Morning
Nick Cave and the Bad Seeds – Albert Goes West
Gary Numan – Complex, M.E., The Joy Circuit, Cold Warning
The Rentals – Friends of P.
Arena Reverb Pedal (see demo video below) had some really nice sounds, while still providing enough options that I'll be able to do some customization for the effect I want, and can adjust for each venue or recording setup. Now I guess I finally need to set up a little pedal board, to keep everything in order! (That's probably secretly why I wanted another pedal...to push me over the edge...!)
More experimenting to come.