I know I'm a fee years late to the party, but I'm in the same boat/crappy seat now. To replace my bh 90 seat with the standard $130 option or look for a cheaper generic version. What did you wind up doing txdon?
Ooh, ten hours too late. I ordered some generic one last night off ebay. Looks like I'll have to drill two new holes in the seat bracket, but it was only $60