If you have the budget to buy a new upper outright, you'd be hard pressed to beat the BCM Lightweight Middy with a VTAC/TROY handguard on it. Might as well go with a BCM BCG in it (at current package prices, you buy the BCG and they pay you to receive a charging handle).
The configuration choice would be if you wanted to go 9.0" Rail a fixed front sight, or with a low profile gas block and a longer handguard (11.0 or 13.0) and rail mounted front sight.
I'd just keep your current lower, use it with both uppers. Your RRA upper will make it a great varminter type gun, and the lightweight BCM for all the the other uses.
The ML3 and Surefire would probably move to the BCM Upper, and you could keep the RRA upper with the MI rail sleek.
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"Being able to do the basics, on demand, takes practice. " - Sinister
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