A Tmaxx is different to a Savage in lots of ways,. If you know what you are doing it can save you a lot of aggro with either one. Although, I would agree that the TRX motors are a little different from the norm, and when you get issues can be a right bitch to sort out. When sorted properly, amazing performance for thier cc.
The Savage is easier to fit other aftermarket motors in, whereas the Maxx will need a different engine mount. Used Tmaxxes do not often come with original motors that work well.
Both the Sav and the Maxx are quite old designs now, and I have seen various versions of both , used, for under a ton recently. These would most definately need time, money and effort to sort out properly anyway, along with no little knowledge.
If I were you Dave, I would get to know my savvy better and fix it up, and if I was buying another Monster would get another MTA4, (just to confuse you!)