What didn't you like about the RRA trigger? If you don't like the initial takeup of two stages in general then a nice single stage like a JARD or an Accuracy Speaks might be a more prudent choice for your SPR project.
If you do want a premium two stage my personal choice would be Knight's without question. The KAC is built for serious, hard use. They aren't cheap, but they are worth every single penny. Of all of my aftermarket AR triggers, the KAC is my favorite by far-the others aren't even in the same league. In a single stage my favorite is Accuracy Speaks, although I like the JARD a lot too.
For what it's worth, I share your disdain for RRA's trigger. One of mine required extensive tweaking before the gritty takeup improved, and the other transformed itself into a featherlight single stage after only a few hundred rounds of M193. I've never owned a WOA tuned RRA two stage, so I don't know how much of an improvement it is over a stock RRA.