Well....not being a fan of the heavy weight braids....(30 lb stuff.) I would use the 7ft rod and reel combo for flipping and pitching grubs and jigs and also Senkos weightless and weighted but would switch to the high speed for the quick retrieve and for turning close quarters fish......the 6'6 I would go with the 8 lb flourocarbon and the 4.2 ratio for top waters and such even light carolina stuff but up the line to 12 or 14 for spinnerbaits and mid level crankin stuff....the slower speed will not hamper the action of the baits as the high speed reel might.

The 6'6" sounds like a good all around rod to me. You could get away with throwing cranks if it's not too stiff, and topwaters, jerkbaits, jigs and worms if it's not too soft. I like stiffer rods for those applications and softer ones for cranks and spinnerbaits.

The 7 fter would make a good flippin/pitchin rod, but would also be my choice for a carolina rig or rev-rig this time of year. You could also throw jigs and worms on it, but would be too stiff for fast moving baits.

As for line, the 30 lb braid would work for a carolina rig because you can use a lower diameter mono for a leader, and possibly flippin/pitchin, but isn't necessary. On almost all my other applications (baitcaster), I use 12 lb test. It works for about everything with the cover we are likely to fish in Washington. I have jumped to 14 lb for certain lakes with bigger bass, but not all the time. I will use 15-17 for flipping/pitchin though.

These are just some ideas from us. You will get a feel for which rod action or line diameter you like. Rule of thumb is keep it simple.

Just to add to the discussion...Regardless of the application, I generally favor a longer rod simply because of the leverage factor.  I like long casts regardless of presentation, flipping, splitshotting, drop shotting, etc.  The longer rod and my height makes for good hook sets.  Food for thought. 

KH.