Hmm lets see on of the first Predators was used by Jason Baney in PA with a 6mm BR to shoot two 4" ten shot groups back to back at 1000 and win the PA world in heavy gun 2 yrs ago.
His gun was a super light Light Gun also. They are tighter than a standard Rem and thousands of LR rigs have been built with them.
Either go with the Predator or TAC 30O. $100 difference in price.
OK on the Krieger for sure. If weight is issue, go with fluted. Decide on contour last after you have decided on stock, rings, and scope and what you want the final weight to be. Right now you are in the ball park depending on other components.
Yes on the 20 MOA base. Order it with the action. Order the heavy lug and fluted bolt, both are about $75 total.
You can spend $150 or more on rings if you want big name, or you can spend $65 on TSR which are very good and just as reliable. Look at all of them at Brownells - World's Largest Supplier of Firearm Accessories, Gun Parts and Gunsmithing Tools
and make your choice. they also have a lot of stocks.
9-10 lbs for the gun is fine if put together correctly and good components.