Being as your dealing with a gas appliance, They are all about the same as far as function and performance when you compare BTUs.
Has your Amana become unserviceable or has it just become ugly from use. Our old Airstream had the original 20 year old stove in it when we sold it. Was not the prettiest with all the rust and chips in the enamel, but worked fine. Over the years I replaced some of the cosmetic stuff to keep my DW happy.
A good price, would be at least 30% off of the inflated "RV" prices your local dealer wants. Try ebay, I have seen a few new ones show up at very good prices over the years.
When I was a kid I was going nowhere fast, now I'm an old man I'm going everywhere slow.