Any good competent gunsmith can work on Rugers down to 3-3.5# or so, if they cant, find a different smith...
A timney is a good way to go, if you need lighter then 3-3.5#, but not neccesary, IMO. It will cost you about $100 for the trigger and installation by a smith. A good smith should be able to tune your factory trigger to 3# for about $35-50. This is the route I always take, factory triggers worked down, its cheaper that way and the pull is light enough for hunting. I like mine at 2.5# for Rems and Win's, and 3-3.5# for Rugers...
Rifle Basix are very good triggers as well. I"ve read and seen quite a bit of them on other forums and people are perfectly happy with them...
