The SCIII is a nice feeling rod. I cast the Avid series a few years ago when I was looking for another 5 wt. I have one. It's med-fast, fast enough but not so fast. I have never cast a SCIV rod.
Maybe some othere can recommend similar action blanks in the Rainshadow, Hook & Hackle, Dan Craft, the non-rod name brand lines that are nice???
If you look through past posts here, there has been a fair amount of good comments on the Rainshadow blanks.
-wayne