I use two Medium action rods, one is a 6'6" fast action and has 10 pound Trilene 100%, I use it for lipless cranks, 1/4oz spinnerbaits, and my big heavy Bagley Balsa B's. The other medium is a extra fast action 7' with 10 pound Trllene 100% which I use exclusivley for Wiggle Warts and crankbaits that dive deeper than 4'.
My medium heavy action rods go like this...
6'6" with 65 pound braid for skipping jigs under brush
6'10" with 17 pound Trilene 100% for spinnerbaits and pitching docks
7' with 17 pound Trilene 100% for flukes, paddle-tails, and Scrounger Head
7'3" with 17 pound Trilene 100% for light grassline fishing (texas-rigs and jigs, no senkos)
I guess I'm a little technique/bait specific :-[