I agree with RW on three basics rigs being all you need. Once you move beyond there:
6' Med/Mod-Fast 6.1:1 casting for spinnerbaits
7' Med/Fast spinning 2500 size, tubes, small jigs, weightless plastics in-line spinners all <1/2 oz
7' Med-light/x fast 2500 spinning for finesse baits 1/16 - 3/8
7'6" Med-Hvy/Mod 5.1:1 casting for deep cranks
7' Med-Hvy/Fast 6.1:1 casting for t-rigs, Carolina rig, jigs
7'6" Heavy/Fast 7.1:1 casting for frogs, punching, flipping heavy cover
6'6" Med-Hvy/Mod-Fast or fast (soft tip) 6.1:1 casting for top water