Check out Rick Mayer's seats. Rick's Dad Bill, created the Russell saddle which was the best in its day. I've owned Corbins and they are great. After riding one Rick Mayer saddle for a day, I agree with all the praise his seats receive and Corbins became a distant second choice. Here's a BMW view:
BMW opinion on Rick Mayer Rick has about a 7 day turnaround from the day you ship him your old seat(s).
And here's Rick's site, About $100 cheaper than a Corbin if you pay upfront, unless you want vinyl - then it's even cheaper:
Rick Mayer Saddles
Ride Safe,
Dennis