Large MBT 2 stage is a damn fine trigger for dirt cheap. I have purchased a half dozen or so. Put 4 of them builds I did for others. Always consistently very good and barely under Geissele G2SE in performance. If your budget is under $100 get a Larue MBT.
I would not piss on a Rock River 2 stage, specifically the 3.5# variants. Some of the shoddiest construction and machining I have ever seen in an AR trigger. The older 4.5# triggers were much better. I bought 2 of the 3 5# Rock River triggers and if there is any trigger I must always NOT reccomend it is that one. I own a ton of Geissele triggers, bought LMT, KAC,etc 2 stage triggers, but RRA is the worst I have seen. I have seen a few good 4.5# versions but never a good 3.5# RRA. Not worth the risk with the MBT available.