TacSol and Volquartsen both make great stuff. If you are looking for barrels, I have been using Beyer barrels to build both 10/22s and the Ultralight .22LR uppers: http://www.carbonarms.us/AR-15-Upper...2LR-upper.html Clint makes barrels with excellent accuracy that surpass some of the "famous" makers.

A good option is a TI receiver and bolt: http://www.tacticalinc.com/elite22%E...ly-p-1432.html Add their barrel block, a barrel, trigger and stock and you can be at about $600 or so with a one of a kind unit you built yourself. I have found good triggers and stocks on Rimfire Central for very good prices.