As I've said before, seats are like matresses. What's comfortable for one will be terrible for someone else. That said, your options are:
Suzuki Accessory Gel Seat - you'll have to find a used one as Suzuki has discontinued this item. Shouldn't be too expensive. IIRC, they carried ~$165 or so MSRP and could be found even cheaper thu some of the higher volume Suzuki parts sources. This seat is a little bit lower than the stocker. The gel is a great conductor of heat, so if left parked in the sun uncovered can get even hotter than a non-gel seat. I can't comment on its comfort as I've never riden on one, but there are several here that have them that will probably pipe in.
Corbin Gunfighter & Lady - Expensive, but still available new. Has the option of a back rest for the passenger that slides into a receptacle in the back of the seat. They don't give the back rest away either. This seat is firmer than stock and also sits you a little lower on the bike. The rider's portion is sculpted and limits moving aft. Some complain it also makes hanging off more difficult. I have this one (and the optional backrest - which my wife LOVES). I was skeptical when I first slapped it on that it would be too firm, but found that for me, firmer was better. Some claim Corbin seats need to be broken in for 500-1000 miles before they become comfortable, some say it just takes that long for you to get used to them... I can't say, mine felt great when I first slapped it on. I noticed the burn I started to get after ~30-45 minutes on the stocker didn't come with the Corbin until the bike was about out of gas.
Corbin Gunfighter - Pretty much same as above except the passenger accomodation is rounded into a stylistic hump. Not really intended to carry a passenger very often - or for an all-day ride.
Corbin Smuggler - Ditto, except on this one, the passenger accomodations are replaced with a piece of bodywork with a lid to access storage - which includes the stock area as well as the hump.
Custom Reupholstery - there are literally dozens of sources that will take your stock seat and rework it into anything possible. Sargent is probably the best known, but there are many others. If you go this route, you may prefer to choose someone that's local so you can talk to them face-to-face and they can get the fit perfect for you. Corbin will also alter its seat s to fit you better is you know what part(s) you want different from their "off-the-shelf" versions.