I have the 855 CBR. It's the crankbait rod thats a little stiffer than the others. I find it to be a little too flimsy for plastics and a little too stiff for crankbaits. Just me I guess. I plan on getting another GLX to remedy this.
Personally for senkos I would have to agree with Quitlimpin about the XF. Also it depends with GLX you have. I would want the lightest they make.