Call Rocky up...it depends a bit on materials. If I recall correctly (and I might not), the cover (leather or synthetic) makes about a 100.00 difference. So it ranges from around 260.00 to "as fancy as you want."
I bought the basic version, and it was really the best money I ever spent on my 02 Adventure. (I do a fair amount of street riding with my bike.)
Note that I had tried the 03 Adventure seat upgrade. Save your money and don't bother with it. It's better, but not worth the difference IMHO.
Lots of folks here like the James seat too, but I don't have any personal experience with that one.
I'll email you pics if you wish, just pm me with your address.