What cam should I get?

Well I've became paranoid about just running straight 10w-40 Valvoline and bought some Rotella-T 15w-40 and now going to change the stuff out so it will have the anti-wear addivtives. I'm not sure what I'm going to run after the 1000 miles after the cam swap. The Valvoline 20w-50 is like $2.49 a quart and the Rotella-t is like $9.00 for four qts. The Rotella is cheaper but do you guys think it is as good as the Valvoline or would be better? The oil wieghts are different too so what you think would be the best out of the two?