Hello Bobby,
I bought the RADIAN 906-4 without the fighting butt, for (unknown) larger rivers, strong winds and heavy trout streamers. It is my travel rod for larger waters and wind.
Your rod version with the fighting butt is slightly faster (I did cast them side by side before buying).
I use a SA Sharkwave GPX WF 6F with mine (the SA Sharkwave Trout WF 6 F is not heavy enough). The GPX line loads the rod nicely and submits more feel. The RADIAN 906-4 FW is nevertheless true to the line weight and is not a 7wt rod.
Just my experience. I didn´t test the RIO GOLD. On the SCOTT web site are line recommendations as well as in the RIO line configurator. Maybe they are a bit theoretical.
Regarding the reel: I use a WATERWORKS-LAMSON SPEEDSTER S3 (Black version with orange knob, see http://www.adh-fishing.de/fliegenrollen/rollen/waterworks-lamson-speedster-fliegenrolle-limitiertes-sondermodell-in-schwarz). A GALVAN TORQUE T6 in Black would also balance the rod and looks good too. Both reels are almost identical in weight. The TORQUE has the better drag system IMO (it can be set more fluently), the line retrieve speed is better with the SPEEDSTER. Craftsmanship is equal on both.
Michael