I just fitted out a new Grand Goldenline deluxe 380.
Very happy with it, I went with a 40hp 2 Stroke and obtain 35 knots with 2 adults and 3 kids (7 to 13 years) in flat water. With just myself and 1 kid I managed to get 40.5 knots yesterday and the boat felt very stable.
I managed to get the dealer to swap consoles with a larger one, which while fiddly to fit to the boat has allowed me more seating and space for all the gadgets.
I posted a build thread here;
New Member / New RIB Fit-out
Best of luck.