From my experience, I think the Yak with Cruiser deck is the best for starting out and solo racing, because it’s a good combo of light and capable, with the emphasis on light. It’ll handle everything you can throw at it as a beginner. Dan Durston uses his for the BMWO. You can also take the deck off for use around the midwest, which makes it even lighter. If you’re by yourself in the wilderness, you may not want to run class IV/V stuff, even if you have the skills. I hesitate to do most class III stuff by myself, but that’s mostly due to my lower skill level. The Cruiser deck is great for class I and II stuff, and works decently on short class III. It will allow the boat to take on a hundred pounds of water on longer class III stuff, and then you have to pull over and dump it or it handles like a drunken pig. Like Kevin, I also put wilderness thigh straps in mine, and they make me feel much more secure in the boat. Mine only weigh 4.4 oz, and 2.3 oz of that is removable if I’m on flatwater. The lack of Cargo Fly on mine hinders me a bit on class III, but I’m glad I don’t have one, just to save weight and bulk. I get the job done anyway. If I’m gonna do a lot of class III or above, I’ll just get a whitewater specific boat.
I also have a Curiyak, which isn’t made anymore (replaced by the Caribou) but it’s not nearly as versatile as my Yak because of it’s lack of a spraydeck. It’s good for calmer and warmer rivers though.
The Wolverine seems like a good all-around boat, but I don’t have one. If I had the money that’s the next one I’d buy. I want to start doing class III and up whitewater, and I think that this would be the best boat for that. I’d probably get the WW deck. But money, money, money.
If I could buy any boats with what I know today, I’d get a Yak w/cruiser deck for lighter/faster stuff, and a Wolverine with WW deck for bigger whitewater.
I use the MTI Journey for a PFD if I expect harder stuff. It weighs 14.4 oz and costs $40. If I were doing III/IV stuff I would get a heavier, more capable PFD (maybe the NRS Ninja?). I use an airline inflatable (EAM GA 12) modded to remove all the CO2 parts if I only expect easier rapids and I need to hike fast. It weighs 4.9 oz. On warmer rivers with no rapids I don’t bring a PFD because I can swim just fine.
I’ve never used a Kokopelli, but I think you can use your 20% off coupon at REI, which makes them the best deal. If I could only buy one boat and cost was an issue, I’d probably get the Nirvana w/ spraydeck and Ti-Zip. At $960 after the coupon, I bet that thing is an awesome value. Not as light as the Yak or capable as the Wolverine, but probably a really good workhorse for a low price.
Because of the money involved, it’s a big decision, so it helps if you can map out your needs and budget for the next several years. That’s what I did and I’m pretty happy with the boats I’ve got.