I think you got lots of price information. I'll give feedback on the OEM Gel Seat.
I bought a gel seat with my 09 V and have used it for about a year. I have a 29" inseam. The gel seat helped a lot, but I still could not flatfoot. I installed Speedy's lowering kit, and then I could flatfoot.
After riding on the gel seat for a year, I found it more comfortable than the stock seat, but still had a sore butt after riding much more than 90 minutes. So, following some comments on this forum, I got an automotive gel seat from WalMart (auto dept), unzipped the cover, removed the content. Then, took my stock seat and removed the staples from the front half and pulled the cover back. Took a bread knife and cut the stock seat foam down to the plastic base, leaving only the foam padding necessary for a smooth surface and shaped to look like a saddle. I laid on the WalMart gel padding, cut it to fit, pulled the cover back into place and stapled down the edges (using a $15 stapler from WalMart). It all worked fine. The modified stock seat is as low as the OEM Gel Seat, and is more comfortable. I have ridden it for over two hours at a time without stopping, and without the previous butt burn. So, you don't need to spend several hundred dollars on the gel seat.