The Boyds walnut monte carlo or prarie hunter are fairly light if you pick the cheapest grain Boyds offers. That is what I used.. Mine feels light but I have never weighed a stock.
If you want to pillar them you can use any metal conduit of desirable size. I have used copper conduit from an old water heater element that did great. A pillar is just a metal pipe cut at 90degs. You can order pillars if you like. Pretty easy to find something in your garage that will work though. It isn't like the pillars on Rugers that have V cuts in them. I wouldn't attempt to fabricate a Ruger pillar. Ruger pillars sit at a 45deg angle where as Savage pillars are straight up and down. 90degs that is. No magic there.