Sounds like a good decision to me.
Hopefully things will keep chugging along for you and you can get on with ExpressJet (far superior in my opinion). A big thing to consider, which requires a crystal ball, is which regional will benefit from the upcoming re-alignment of RJ flying.
XJet (SKYW) is a pretty well run regional that will most likely be around in some form for the foreseeable future, and will probably be a part of whatever the next big thing is. I can't say the same for RAH as the wheels seem to be falling off the wagon over there. Their aborted attempt at running their own airline has been a miserable failure, as predicted. The bright spot is that this is a good thing for the industry overall - no ill-will wished towards my fellow RAH pilots. My biggest ulcer over the whole thing is that Bedford got his hands on TWO classy operations (MidEx and Frontier) and completely destroyed them - preaching all the way to the bank.
I should clarify -the crews were great when I was there. It was the seedy management team that made it undesirable. To answer your question a few pages back about why RAH was not a good place to work: it was a Mickey Mouse operation. They had grown considerably, flying jets all over the country, but were still trying to run it like a Beech 99 operation out of Jamestown, NY. I constantly felt like I was going to be hung out to dry, and if I didn't watch my own back (regarding MX, dispatch issues, scheduling limits, etc) I was gonna have a career limiting event. Several guys did.
I could give many examples, but my favorite was a return to the departure field for a runaway elevator trim system (due to crappy MX.) After we ran the procedure and safely got the aircraft back on the ground, the Director of Operations called and gave me a load of $hit for not limping the aircraft back to the hub for repairs. It would have been over an hour flight (at normal cruise which wouldn't have been possible with the trim situation) passing multiple suitable divert fields. I had to threaten to get the FAA involved in our conversation to get him to back off. Like I said, just one of MANY examples of how an airline is NOT supposed to be run.
Again, this was over 5 years ago and I hear it has gotten much worse with the contract negotiations and dismal financial performance. The only good thing was the massive growth that was occurring 10 years ago, which allowed for quick upgrades. With that no longer being the case, I think you're smart to look elsewhere.
I have many friends that are still working at ExpressJet that have given me a pretty good feeling for how they do things over there (not to mention having jumpseated with them many times - Thanks!) Compared to the other regionals, it is a solid operation with an above-average contract. I think that's about the best you can shoot for until the future of the regional industry comes into focus a little more.
Don't get discouraged and continue to make fact-based decisions (like you are.) It seems like it's been taking forever, but the hiring boom at the majors IS coming in the next couple of years. This will get things moving again at the regionals and you will see upgrade times come way down again. In the meantime, try to enjoy yourself and position yourself as best you can.
Good luck!