If you search this site you'll find a whole load of manufacturers and names.
Might be worth a look at:-
Ribcraft
Avon
Redbay
Humber
From what I've seen it'll be a whole load cheaper to buy engines and trailers in the USA.
Your $4000 shipping at a rough guess should cover the cost of bringing one over in a container-as long as it'll fit in a 20' container.It's VERY expensive retubing in the USA and if the prices are similarly over the top for whole boats then it might well be worth looking into.
I doubt you'll be able to do anything with a rib that'll really stress any of the ones that are traditionally used as dive club boats over here though. You'd be surprised how tough they are. There's people on here (me included) beating the crap out of 20-30 year old Avons in all sorts of conditions and they just shrug it off and take it.
There's a redbay for sale on their site that'd pretty much fit your criteria too and would come in at less than $45000 including shipping it over.
http://www.redbayboats.com/preownedboats.htm
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