I got a tall sissybar when I bought the bike, but wish I had bought the luggage rack that attaches to it at the same time. Luckily I found one for sale on this forum. If you do any 2 up riding, or plan on doing some long trips, the sissybar + luggage rack combo is good to have.
For any accessories you're thinking about, just do some searches in this forum. Nearly everything out there has been posted about in this forum, and usually there's pictures with the posts.
ps. I finished high school just east of East St Louis, in Edwardsville.
