Unless you are going to keep it covered, hypalon is a requirement, imho. It will pay back over the long term. Covers, however, are an option for a couple hundred dollars or less.
You might get more specific suggestions if you describe your plans for it. Haul it on deck, up on davits, use to get to mooring, tour anchorages, inflate/deflate between uses, etc. For example, there is a reason an RIB is out, but not clear why.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.