So I just bought this guy for playing solo acoustic gigs at smaller venues. It'll do the job and the price was right. However:

I'd like to add just a smidge, a soupcon, if you will, of reverb. My Nady has an effects loop. Can somebody suggest an inexpensive reverb unit I could stick in there to get what I want?

Alesis Microverb or Nanoverb. They'll do the job you want and you can pick them up cheap used.

Nice 1+ on the Micro verb. I had one, it worked.

Boss RV-5 foot pedal runs about $149 new...has about 6 different reverbs (spring, hall, etc.) I have one and it works great for guitar...a buddy uses it on his small PA and it works great...has stereo in and outs so you can use your imagination and plug in a guitar and a high impedance mike or split signal and run it to two channels or use in or out of an effects loop...

+1 on the Alesis units. I got mine off eBay for about $75, and it's been wonderful!