Seeking dinghy/outboard advice

Folks: I sail a Cal 34. Cruising mainly up and down the might Columbia River out of Portland, Oregon, we have been using a very reliable, easy to row and almost indestructible 8' Walker Bay. For a variety of reasons, I am giving serious thought to a small inflatable dinghy with a small motor to use in the San Juan Islands where the water is very cold and it is often necessary to use a dinghy to get to shore. To power it, I am also giving thought to a 5 hp Lehr propane, probably with a smaller external propane tank. I have read both glowing and highly critical reviews of the Lehr with little in the middle. Among my priorities for the dink are price, weight and size when stored. I also want it to easily and safely accommodate both my wife and me (the Walker Bay is a bit small for the two of us as I am tall and less than slim.) I am giving thought to the West Marine PRU-3 or maybe the RU-250, or something like them. One of my concerns has to do with any possible downsides to a slatted floor versus a much heavier and expensive inflatable floor. Any thoughts on these and other dinghies? Downsides to a slatted floor? Propane outboards and the Lehr in particular? P.