As far as poly goes, K-var is one of if not the best. It is OEM on Arsenal rifles. They also sell some very nice wood for your milled rifle.
Ironwood makes some beautiful wood stock kits, I've had a maple set on a Hungarian stamped reciever rifle and a walnut set on my Bulgarian.
Stock fit goes like this, a stock for a milled reciever can never fit a stamped reciever. A stock for a stamped reciever can be made to fit a milled reciever if you are skilled and patient. More work than it's worth IMO.
The Tapco SAW grip is good stuff. They also make a fixed stock but I have no experience with them.
I used a SAW grip before I discovered the
Ergo grip, it's the cats hind-end.
As the owner of a milled reciever Bulgarian rifle I can tell you that unless they are designed specifically for one, most parts will take some dremmel work to fit a milled reciever. Both the SAW and ergo grips took considerable grinding to fit.
Stamped on right, milled on left.