I've had a D800+ as my workhorse amp for a number of years now. They are fantastic, on their own or I put a valve pre-amp on the front end for an extra vintage sound. I find the high pass filter really effective to tackle boom in different venues. The bag thing is annoying, but they are not much to shout about to be honest. Roqsolid would probably make one for c£50 which would be much better, or ask Bass Direct whether they have something in stock that would work. I would hold onto that amp. There are also a lot of lovers of Mesa here and they come up quite often.