I mainly use an Epiphone Valve Jr. amp for my archtops these days. It does not have reverb, and sounds OK without it, since I have a fairly airy music room with tile floors. However, I did park a Holy Grail reverb pedal set at 9 o'clock in front to stretch out the sound a little. Sounds closer to the sound my brain is listening for.

I recently have been playing a lot of nylon string electric through my Fishman Artist amp. I have been going for a light, airy sound ala Bill Frisell, so have been playing around with effects a bit. Right now I have reverb and chorus set at 12 o'clock. It's a light chorus effect and kind of colors the sound and softens the attack, rather than some big huge '80's thing.