Not sure about the rhino fold, looks a bit messy and big. The good thing about the joey is that once it's folded, you can use the seat post and saddle to wheel it along, or drop it down to make it a smaller folded package.
I know what you mean about price setting then blowing. I don't think I have event built up anything that's stayed within budget, there's always something that elevates it to another level, then all bets are off.
On the sold bikes on the bay, there would be a lot of compromises based on what you were looking for, such as disc brakes. Both would have needed a bit of work if they were mine as are certainly different in their own ways and imo not a good thing.
You've then got the odd 24 inch size. I didn't know there were two, and the airnimals come with the one that has (or had, things could have changed) limited tyre options. By moving to a jump style size, many more tyres are available.