I have two:
-Armalite "2 stage tactical" trigger - this is a completely different design, like an M1 Garand trigger. It's a pretty good two stage. Not that light, but very crisp. Reset is somewhat longer than a GI. I would recommend this as a good hunting trigger on a budget.
-Spike's Tactical "Battle Trigger" - this is basically a GI trigger with a nickel-boron coating. It's a nice crisp single stage. Not that light - probably about 6lbs - but no grit, little to no creep, just a nice clean break (though not as clean as the Armalite). At $60 this is a very inexpensive upgrade, and as a GI trigger with an extra hard coating, it should be durable.
I don't own but have briefly used two Geissele's, one SSA and one DMR. Both were great, with the DMR being ridiculously light and crisp. The SSA very crisp and fairly light, but still reasonable for various uses. I am tempted to install an SSA in something, but I'm not sure it would actually improve my shooting.