The early '90s Narwhal 5.0/5.2 RIBs performed quite well with low power - they have a mediumish Vee hull. I've skiied comfortably behind a 5.2 with a 3 cyl 50 Yam, carrying 4 adults on board
That one may be a good buy for the money - a little bit of tidying up that shouldn't cost too much. New toobs are a big advantage as Narwhal originals are PVC (or some other proprietary brand which is another name for PVC
) Clamshell Merc 60 was never the most exhilerating outboard, but would probably be ok on that hull.
They're not as 'hardcore' as a Searider, but a lot more roomy, with a flat GRP moulded deck.