Cletus, I agree with comeonavs, decide which rod (rods) that you want to use it on. I find my rods cast well with the RIO Gold (or SA Trout) in the weight specified by the rod manufacturer. The only exception is my 4wt. VXP. It likes a SA GXP (1/2 wt. heavier) to cast better.
The owner of my local outfitter tells me that he over-lines all of his rods. That's his opinion. Opinions will vary here due to personal preference.