You also might consider the Kawasaki OEM replacement seat for the Versys-X 300, which I believe is called their "Ergo-Fit" seat. From what I understand the Ergo-Fit seat is what came stock on those bikes sold in Europe. I've used various seats on different bikes over the years, including Corbin, Seat Concepts, and Sargent. Of course everyone's different so one person's recommendation may be totally wrong for someone else.
My Corbin on my old Kawasaki EX-500 was perfect; very firm yet shaped just right. I could take off on that bike and the only reason to stop was that around 200 miles I needed gas, but not because my butt needed a break. On the other hand, I later bought a used Corbin for my FJR1300, and that was a big mistake. It was hard as a rock and extremely slippery; I tried every kind of product to try to reduce that slickness, to no avail. Something to consider if buying a used seat. Regarding the Corbin seats, you'll find them extremely firm when new, but those folks warn you to not even bother complaining to them about it, until you've got about 1,000 miles on it first.
I found the Sargent World Tour seat to be the most comfortable on my V-Strom 650, and Seat Concepts worked out pretty well for my DR650. I weigh 155 lbs, and so at your weight, IF you go with Seat Concepts, don't make the mistake I did. You have to specify that you want a softer density foam, otherwise I think the standard kit is for people more like 180 lbs plus. I'm not sure if that info is on their online order form, but I had to call them to get it straightened out. Also, you can specify different material for the actual cover, and I found that their "Gripper" material is maybe a bit too grippy. Riding on that seat wearing jeans will make you a soprano after hitting the brakes a few times.
The Kawasaki Ergo-Fit was much cheaper than any Corbin or Sargent, and for me it's comfortable enough that I've done a couple 1,000 mile days on it, plus many more of 600 miles plus. If you bought your bike at a dealership, see if they'll give you a discount on any parts and accessories, for buying a new bike with them. That's what I did and with my discount, the cost of the Ergo-Fit seat was a no-brainer. Good luck with whatever you choose!