I personally love the 6'6" length for all around use, in spinning rods and baitcasting rods. It it easier to work with on a boat, less chance of bumping the tip on the ceiling, or ceiling fans, getting it in and out of the house, and throwing TONS of various baits.
I have the Mg "chatterbait" rod, which is 6'10" MH, and it seems to have a limited use of lures that I can whip around when casting, which also seems to generate a few more backlashes than the 6'6" lengths.
It's your money and your call, but I thought I'd offer up my honest input on best overall length for your investment.
Welcome to the Kistler fan club, and agreed, it won't be your "last". One is just never enough.
