See if you can find out how thick the aliuminium is on the hull and sides .

I've heard good things about Quintrex boats and I like the high freeboard.  Good brand of outboard, newish looking but not so flash brand of trailer and auxillary but overall a good rig. See if he'll chuck in some GPS cray spots and make sure it all runs as it should but yes this is a good first boat .

I had the 5m cuddy version back in 2005. It was alot of boat for the money back then. 35k got a fully painted hull, canopy, clears, 100 ltr underfloor tank, nice upholstered seats, fishfinder gps and a 90 merc which pushed her along to 40 mph easily.

The difference between a 3mm hull and a 4mm is 33% and that 33% might be quite important as the boat ages, says he with 4mm hull 23 years on.

Personally I think you'd be better off in the end getting something NZ made for NZ comditions. There are a few brands that have pretty good reputations - just go back through some of the threads on this site - there plenty of good comments on the well built NZ boats.
First impression of the Quintrex is a pretty well finished boat, but can't help thinking these are designed for calmer water, estuary and river fishing in Aussie, rather then some of the back breaking crappy NZ conditions you'll run up against in our seas.

Here's something to inspire you - a 190kg marlin caught off Whitianga out of an FC465 Kiwi made tinny runabout. It's basically a 4.3m boat with a stern step. 

It's nearly always a good thing to get an ex fresh water boat so really worth checking out those central North Island yards

I have a Seaforce 430 Winna and it’s an awesome boat for its size. Good for 2 fishing and can fish 3 ok if the canopy is down. We also tow the kids around etc no problems getting in/out of the boat. Always thought I’d have tinnys but having this would stick to fibreglass. Would like to upgrade to the 530 Ute.

ive got a 2005 quintrex 395, best boat of that size ive owned... of that size ive had a ramco and a fyran/parkercraft.