Stoo
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Just like any other boat, the ideal size is two feet longer than the one you have.
I spend about half of the time wishing my boat was a couple of feet longer, and the other half of the time, I wish it was a couple of feet shorter. That leads me to think mine is about right.
Boat prices increase exponentially so an extra couple of feet that might only represent 15% of the length, but it might very well add 60 or 70% or more to the price. Because EVERYTHING has to scale up... the engine, the trailer. And then the really big thing... the tow vehicle.
When I bought my last RIB (20' Zodiac Hurricane with a 150) I owned a V6 truck. After blowing three sets of rings, I had to buy a Tahoe. To quote the boat dealer, "Nice accessory"
There is also a huge range of build quality. For example, there is a "new" line of RIBs around called Highfield. They promote themselves as being a New Zealand company, but the boats are made in China. They are light duty, the tubes are PVC (as are most budget inflatables like the Bombard referenced in the post I quoted) but the price is right. If you are a weekend warrior, and keep the boat tarped (UV light can destroy PVC tubes in a very few years) then they're good value. My boat which is hand built and basically military spec is Hypalon (which is essentially indestructible, but also very repairable, where PVC is not) but it's worth a fortune. I was fortunate to find a used one, but it's about double the cost of the Highfield or Bombard.
The OP might want to look up rib.net Its the Scubaboard of the inflatable world. It's based in the UK, where RIBs are much more common for diving, but there is a North American forum as well.