Depending on how much you want to pay, check out Geissele's line. Their High Speed NM "Match Rifle" is adjustable, easy as most to install, pretty straightforward when adjusting. Little pricey. This is my only experience with Geissele triggers, and I like it so much it took the place of a 3lb Timney that is now selling on eBay.
I also have a RRA 2 stage in a 15-22 and love it, great trigger especially for the price.
I hear alot of good feedback about many triggers. Probably can't go too wrong with any listed here.