Depends. If you want to go custom, the best way to go is buy a set of tubes (I'd suggest Sotar or Wing) and have a board member named Osprey (not the boat, but his name on here) build you a custom frame. He does the best custom work I've seen.

But, if you want a prebuilt boat, the best on the market is the Steelheader. It sounds though you want more a kickboat then the standup platformed version. If you want the ultimate boat that suits you to a T, do the above mentioned first. But, if you want to go with a premade boat, I'd say go Steelheader/Osprey all the way. It seems when it came to whitewater grade boats, he set the bar and the rest are trying to measure up. There's no contest between the Outcast and the Skookum when it comes to buying a production boat. But you'll be as satisfied, if not more designing your own boat.