By the time you woudl by a Savage with a thumbhole stock you would be spending more than buying a Steven's and adding a thumbhole stock, that I am convinced of. Of course to get a thumbhole factory on a Savage you'd also get a bull barrel, which would be worth the extra dollars in my opinion.
When I did my trigger work I just kept in the back of my mind that if I can get this to work it cost me a few hours time, if I mess it up I can get an aftermarket trigger for $85.
The way I got mine it was cheap, unless you figure that the Rem 597 I traded in was maybe worth $130 or so, I still look at it as a rifle that cost me $5 that I didn't want.