I know you said on your opening post that "only oneneeds to be mentioned here as the other will be a powerboat..."
Actually, both boats have an impact on each other, along with your needs, because what you THINK you need or will be suitable may not be what you really need. Here's what I mean:
Figure it's 800 nm from Galveston to Belize.
Referencing your other thread, figure you've got $300K to spend on a powerboat
Also referencing your other thread, figure on a two week vacation window.
$300K will buy you a new or newish SeaRay in the 34-40' range, depending upon the year.
Let's use this bad boy as an example:
Twin Cummins diesels will push her at a cruising speed of 27 knots.
900 nm / 27 knots = 34 hours
Burning 40 gallons per hour. 40 gallons x 34 hours= 1360 gallons.
The boat shown above has 300 gallon fuel tankage.
So, you ain't making Belize in one jump, besides...
Have you ever pounded along at 27 knots?
For THIRTY THREE hours? Even a comfy boat like that Sea Ray is gonna be loud and sleep is gonna be tough. So, you get to your destination fatigued and cranky and you need a day to recover.
Trust me, what is wheeee! for an hour is a whole lot less satisfying for a day.
Okay, so the go-fast boat and weekending in Belize is out. What, you ask, is the powerboat alternative?
Big range, lower fuel consumption, arguably kinder motion thanks to displacement rather than semi-planing hull. Your same budget buys you this:
Cruising speed is 10 knots. Now it is 80 hours to Belize.
She'll burn 3-5 gallons an hour depending upon conditions and speed. With the tankage of 324 gallons, you'll juuuuust make it, but you'll be eyeballing the gauges for the last half of the trip.
So, Belize by power boat is not "be there now"-able. The fast boat won't get you there, and the slow boat won't get you there now.
If jaunting down to Belize is what your wife wants to do, she's doing it by sailboat.
Or, maybe I can interest you in a used Cessna?
So, counselor, you have to manage your client's expectations. I suggest you talk your way onto some of the boats that interest your wife, get some time on the water, and do the math.
Now, sail to Belize on this:
2000 Robertson and Caine Leopard 45 Sail Boat For Sale - www.yachtworld.com
Figure 9 knot cruising speed= 100 hours to Belize, Under sail. Faster than trawler, more comfortable, MUCH more room, MUCH MUCH quieter, even under power, than the SeaRay...
and you can hang a go-fast boat on the davits. Treat the mothership as the mother ship and your wife can indulge her be-there-now side exploring in the RIB.