Giessele makes great triggers, no doubt.
If, on the other hand, you aren't shooting a .25 MOA varmint rifle at 600 yards at prairie dogs and don't want to spend that much
another possibility is simply getting a set of JP competition trigger springs and installing them.
Note: these are competition springs advertised as not suitable for self-defense purposes as they may not set off hard primers blah blah blah----legal disclaimer. That being said, I have these springs in almost every AR I own, and after tens of thousands of rounds (literally that round count, from Hornady match to the cheapest worst Russian steel-case ammo you've ever seen) the trigger has
never failed to fire any round seated in the chamber.
So, YMMV.
JP Competition springs from Brownells are under $10.
In terms of actual full trigger groups, I've heard good things about the HIPERTOUCH 24, which is a fairly recent addition to the possible trigger assemblies out there. It is designed as a service rifle trigger, yet gives adjustable weights from 2-4 pound pull. (Other versions are even lighter with more adjustments and less pre-travel, for people who REALLY want to spend money on Multigun rifles.)
A guy who shoots Multigun at ENGC is sponsored by HIPERTOUCH, if I recall correctly---one of these days I'm going to have to ask him if I can try the trigger on his AR.
Big question is what you are going to use the AR for? You can get some amazing triggers out there for varmint hunting and such---but you might not want them on a service/SD rifle, which you'll want to be 100% reliable. Multigun folks tend to want both---a light trigger with little pre-travel and a fast reset, but highly reliable--so they tend to have triggers that are halfway in between.