Butt seriously...
If I had it to do all over again, there are a few 'gotta' haves...
1) a good tall windscreen, perhaps lowers
2) floor boards, perferably with iso-pads to minimize vibration
3) risers to sit you more upright and put your arms in a bent position
4) a back rest that you can lean back on. You can subsititute a hot chick on the passenger seat
5) a set, or two, of highway pegs so that you can change your leg positions. Preferably one's that don't stick out and can catch. There are several type now... Kurykyan makes pegs that attach to the floorboards while others attach to your engine guards.
6) a good seat most of all. Nothing sucks worse than riding all day on a bad seat. Airhawks, butt buster, sheep skins, et all only make a bad seat tolerable.
Let us know what you decide.