When I am in my office (spare bedroom) I use my Line6 PodXT Live with the amp simulation set to Fender Twin and cab set to Jazz Chorus (which I think models the JBLs) and I am able to get a very nice tone at a volume that won't wake the wife
So far at recent gigs I have been using the same pedal with amp simulation turned off to get my Mutron, overdrive, and delay, and have been very satisfied. I have owned a real Mutron-3 and also a Qtron, and think that this tone is close enough when mixed in with the band. That said, we are not a purely Dead cover band, so I just need something convincing for the Dead/JGB tunes we play. The Line6 pedal also serves as my backup amp; can just go direct to the board in the event of amp failure by simply turning the amp models back on and that will get me through the night. These are easy to find under $200.
I did, however, just score a pair of E120s this morning for my new HT 2x12 clone, and will be getting the SMS JG some time soon. I am searching for someone local to install a Super2 in my PRS Custom and also put the Waldo buffer in. Having a hard time finding someone local to do the routing and the wiring for me...