Zodiac Futura is a bit of a classic. In terms of durability, you'll find many of these boats going strong 15-20 years after manufacture if well maintained. Material is Strongan Duotex (PVC). The MK III is big at 4.7m and if it were me I'd be looking for one with an aluminium floor (HD) rather than the air floor (FR) for rigidity. Power to weight ratio, then a 50hp is perfect. Can be built from 2 bags, but for ease of use, then trailering is the way to go, given the weight of the outboard, plus rigging.
Lots of Zodiac accessories and seat kits available, but be warned... they're not cheap.