All good advice above from veterans. I haven't posted much but have had 3- Rio 51 and also whh magnum 57, here's my observations.
Rio 51 Fuji motor once tuned ran well, 2nd boat had stock zen ran nice, current Rio has mod zenoah and the boat runs 50-55 all day no issues.
whh Magnum 57 is HUGE, runs great and is an overall better built boat, runs 30-35 and excels in chop and rougher water. I got it last fall from a WHH veteran who dialed it in and I haven't messed with it, adjustment wise.
When I run both back to back on flat water, the rio screams and the mag 57 is a touch boring but BOTH look great on the water.
If there's a bit of wind and chop the Rio runs good but the Mag 57 really shines.
Final thought, you can prob find a Rio 51 for a decent price $300-400 and learn about gas boats, tuning etc. Or spend more money upfront, prob $550-800 and get the WHH boat. Good luck and there is a ton of great info on both boats here on RCU!