True that, what was I thinking!
Well, in all fairness there is a reason for that which I will touch upon.
If I were you, I would not to go to GoJets.
You admit that you have an 'interesting' background in the 135 world and that you have at least another 4 years at the regionals (as a side note, when you listed the reasons does PRIA have anything to do with it? Because, even though something may not show up on a PRIA request after five years, the carrier can do a FOI request or just plainly ask you, 'Why did you leave such and such place? Was it on your own terms?'). I do think, that even with this 'interesting' background in the 135 world, you will be able to get to a career orientated destination. However, it will be VERY important that when you do, you have as much work history at the 121 world as possible at one carrier. Let me ask you this as well, did you interview at other places than CMT? Were you offered jobs there? If no, then why do YOU think that is? If so, why did you pick CMT? With all that said, the frank matter is that if you do get fired at a 121 place (even a regional) that closes a lot of doors. That coupled with your 'interesting' 135 background, more doors will be closed.
There is a reason GoJets is having quick upgrade times. I have been there, done that at Colgan. As someone else mentioned in this thread, GoJets doesn't seem to kind to their employees when they have a singular issue that is relatively benign. I heard that as well first hand from guys who worked there. While CMT has had their issues the guys I know there say the place is turning culturally.
Then there is the background on how GoJets was started. I was talking to someone at another airline than mine, who has does hiring at his 'career destination airline', who was at TSA when the GoJets alter ego was started. He is a person who would be great to have interview you, unless you work/worked at GoJets.
Have guys from GoJets been hired at other places? Absolutely. Will guys from GoJets be hired in the future at places? Absolutely. But, the bottom line is that there are more guys who have moved on from TSA that are First Officers/Captains at 'career destination airlines' than there are from GoJets. I flew with four over two airlines, and three still had anti-GoJet stickers on their bags (two left TSA before GoJets even started, but felt the need to get that sticker on their bag to support their friends still there). Anyway, see how I am painting the picture? Why potentially expose yourself more so to a place with a crummy culture and more guys who vehemently want nothing to do with a pilot from that company?
If you must absolutely leave CMT under ANY circumstance, then I would look at a place like Mesa. They are another ALPA carrier and I think they are turning a corner culturally as well. Why is an ALPA carrier important? Well, if something does happen, they do a much better job of getting their member's jobs back than a place like GoJet. Once again, you really can't afford anything to happen.
I know you haven't always laughed at my jokes. That is fine, I just thought I would offer my opinion on this. I do wish you the best and I do think you will be able to accomplish your goals. However, I would think long and hard about leaving the place you are at now. I certainly wouldn't do that for GoJets.