Not sure what to tell you. I'd think that the Marquee would be similar enough, but I'd only be guessing.
You've rooted it, de-bloated it, and are at a point to where you can tweak things. I think that's not too bad.
I've reached a point with the OB where I'm at a basic, custom GB ROM with as few thrills as possible. If I had to go to a stock, rooted GB, I'd be more than happy. The OB is a little long-in-the-tooth, and ROMs past GB aren't stable enough for my needs.
I would NEVER add an ICS or JB ROM on this phone FOR SOMEONE ELSE. Tearing the back off the case to pull the battery gets old. Your wife will hate you.