Can't go wrong with Timney!
+1.
My feeling as well. I don't spend time messing with the old trigger, just replace it.
Although I've not tried the Trigger Tech, it does sound pretty good.
After getting a few Timney 501 triggers from EBay, $105 delivered, figured that was good enough. Not sure you can get a TT that cheap. They may be worth the extra for all I know. To me the 501 is plenty good and I like the price. You may not always find them that cheap, but should be able to if you shop, I did.
DF
