I have a reasonably priced scroll-saw Bob (from Lidl). I threw away the blades supplied with the saw and purchased myself a range (tpi & type) of Olson saw blades – the best upgrade you can make. It is a 'vari-speed' saw but I only use it for wood. I think it would cut non-ferrous but I've not tried it. It is generally used on relatively thin wood and plys (2 – 9 mm).
I also have an INCA bandsaw, which is a very nice machine that is no longer made. It can handle blades down to 3mm but needs special blade guides to do so. I do have a 1/4" blade but mostly use various 1/2" blades, as I generally use the saw for re-sizing stock. Some INCAs had motors separate from the saw itself and (with pulley changes) could be used to cut metal but mine is fixed.
I have several ways to cut sheet metal – including nibblers and several jigsaws. My smallest (Proxxon) jigsaw is very light duty but does make a very fine cut. However, most of my small (thin) work is simply cut with a jeweller's saw. It cuts surprisingly quickly and with a little practice is very accurate.
So, I'd suggest you think about the 'balance' of work you need to do with your (model?) "boat hull" and if it's mostly wood-related work – then focus on getting a tool that is good [enough] for that role. If there is not much (thin) metal-work required, a jewellers saw will probably be sufficient to do it.
If you do decide you really must have a multi-purpose scroll saw – then you probably need a Hegner (double your budget) or to find a used 'Diamond' (no longer made). A Diamond will do both jobs for you but take up more room. There was a spate of them on eBay recently (in the region of your budget) and I was tempted but decided I could manage with my existing tools – so common sense prevailed. 
Regards,
IanT
Edited By IanT on 27/11/2020 13:13:22