Hmm, Mark V you say.... I personally like my TC-50 over my Mark V any day of the week. But that is my personal choice. However if you were really only interested in CH1 and CH3 I would suggest a JP-2C as that is all it is basically. Clean and monster punch. You may feel the TC-50 is more like the channel you did not use with the MKV when you had it. I would say it is more crunch than compressed. The JP on the other hand is all beast but you can make it crunchy if you so desire. JP-2C is not a bedroom amp and neither is the TC-50. Sure both JP and TC could be played at lower volume levels. You can also use 6V6 in the TC-50 to reduce the power level down to 25W and that to me was rewarding, even though I much prefer the EL34 tubes in the amp.
The best answer to your question is to do one thing..... find a dealer that you can get too that has the amps you are interested in. I could compare the following (ignore the cost factor at the moment); JP-2C, TC-50, TC-100 and the Mark V. Since each amp is different I would also suggest to down load the manuals for each and print out the suggested settings page from each manual and take that with you. If you discover one of these fits your needs, that would be where to start. That would give you some idea if you need to wait and save for one vs the other. [I generally keep a guitar fund going (it is actually a separate account that gets deposits every pay day, not very much mind you but over time that sum grows and before I realize I have enough for something new. I may have a few amps in my collection. Everything was bought new except for the two RA100's and I did not use a credit card to buy them. It all came out of my guitar fund (so there is no interest or monthly payments). Yeah, there have been times I needed to tap on my guitar fund for other things so it can be used as an emergency fund if needed. I started this plan almost eight years ago when I started a new job. Yes, it take time but in the long run by the time you have saved up for a new amp, Mesa may have something better by then. ]
I personally would settle on the TC-50 but that would be me. However it has been some time since I played though a new Mark V, mine may have been a lemon from the start so I too would revisit that. Hard to tell if the TC is the better amp for you or would you be more interested in the Mark V. Then I ask one question, if you liked the Mark V but no longer have it, was there something wrong with the amp such that you no longer have it?