Great looking boats but for a rescue craft I reckon it's quite important to have plenty of open deck - not a cabin that takes up the whole front of the boat.
I would prefer a walkaround style - something like the Protectors from NZ.
For use in shallow waters a jet is essential along with an aluminium hull to take the bashing. Also no transom so the water can go straight out of the back. Something like an Ocean dynamics fits the bill - and they aren't ALL ugly.
http://www.vimeo.com/clip:72013 (slightly better quality)