Check out:
http://www.longboatoutfitters.com/
I run two white river boats, both 21 feet, one an aluminum 36" floor, rockered on both ends mostly floating and where I do not want to bang up my glass boat. The other a 42" floor Champion, that is flat and smooth with a slight rocker at the back. Love both. The only way I would look at a total flat boat is to run a jet. Trouble with a jet in this area and White River is rather than the small gravel like on the Current we have many boulders that hide just under surface, when you hit one at speed that is needed to plane on a jet, hard on the boat and often dislodges passengers (alway wear a kill swithch) The other issue with the jet (I can talk bad because I have one) They suck up that coon tail and become clogged with leaves in high water, they are noisy and too large to run legally on the Buffalo or Crooked. A river jon wilh a 9.9 will float over most stuff and go most places. That said the Supremes are beautiful boats, (again I can talk bad because I have a nice finished boat) a source of pride and a joy to fish out of. That said it is a river boat and is going to get banged, a Shawnee or J&S in a plain type finish is a lot easier to stomach than that beautiful chips of red fiberglass and gel coat floating down the beautiful clear water..... my 2 cents
g