that's like asking guys what barrel they suggest.
What you want is probably greatly dependent on how you want it to function.
I've got a modified factory trigger with a 3lb spring kit that cost about $35 to get into the sweet spot. I use that on my integrally suppressed 9mm after I pulled it out of my precision 243WSSM.
Put a 3lb Timney into my 243WSSM and it's a sweet set up, but pretty hard to justify more than double the cost of a very well modified factory trigger.
I just don't see it. Not taking anything away from Timney, but once you get any improvement over "FACTORY" you start hitting diminished return.
The improvement you get from a $35 mod, to a $150 drop in, to a $250 ultra awesome...isn't really that big of deal to me.
I've got a 2 Stage NM in my Armalite and that's nice as well, but there is no way I'm dropping $200+ on trying to improve it.