14' is the perfect size for you... small enough for solo rowing, large enough to throw gear in for overnighters. Check nrs (nrsweb.com) for good boats at reasonable prices, and good modular fishing frames. Downriver equipment in Wheatridge, CO is another good shop to check out with their own line of boats.
In regards to self-bailing floors, the nature of the idea is to allow water to pass through, so yes, you will have a little water splash up into the boat from the space between the tubes and the floor. If you're only doing class I-II, mostly fishing-type water, then this will be minimal. The only way to have a dry floor is to keep it on flat water. A bucket-boat, or non-self bailer, has too flexible of a floor to support a standing fisherman, unless you get a really heavy frame with a hard drop-floor. Not the easiest setup to deal with, and you don't see too many folks on float trips with this type of craft. Good Luck!