Hmm. Large FOV, shortish FL, longish ER - you're asking a lot.
I think you'll find most EPs that do all this will not come cheap. An option might be to look at a barlow - that's if you are considering longer focal length EPs also.
Saturn. I have seen its rings in a Russian made 25x spotting scope years ago and had an absolute ball when I did. More power will show ever more detail until you hit the seeing limit (that usually happens before the scope is exhausted).
The fact that you could not even see the rings as such indicates extremely poor seeing, a scope that hadn't cooled properly, or was in need of collimating. Or a combination of these.
The attached pic shows Saturn near the Moon. It was taken handheld through the EP from a city location through thin high cloud and seeing conditions that were average at best. Power was 101x.
Edit: The Saturn pic was taken through a 60mm refractor. Just to give you an idea what it might look like at around 100x