Welcome Dave. As is traditional I'll ask if you've seen the "which SIB" sticky thread in the inflatable section. Have a good look through and then post some queries in that forum specific to your needs/use.
Sunsport's comments are very valid... as is Pikey Dave's above.
Will you be inflating the SIB for each outing? Have you read the air-floor vs wood/alloy floor debate. New or used? Approx budget? Any existing brand loyalty?
As an example have a look at beerbelly's outfit which he's been using for fishing....
honwave ie32 package
Bigger motor than you were thinking but that's no bad thing.