I had this one made locally using my seat pan. About the same comfort wise but I was looking to lose the plastic cowl. Had the hump moved about an inch forward. Cost me $190. Sorry about the pic, only one I can find at the moment.
Just had this made. Memory foam and gel seat with all leather upholstery. 2 Tone. The seat was a t100 seat and the same height was maintained and a slightly hump added for the passenger area. Came out nice. Lot more comfortable than stock plank.
I had big plans to have Loren @ Baldwin Motorbike Saddles make me a seat similar to the one shown below. I really liked the style, as the front looks like an old school solo seat, but also has a good place to mount a tail bag (or even carry a pillion). It wasn't going to be cheap, but they use the very best materials and hand make each saddle to your body dimensions, and preferred riding position.
I ultimately decided not to do it for several reasons... not the least of which was cost. So if you're wanting a good, inexpensive stock Bonnie seat to have reupholstered, shoot me a PM. I have one.