... it is much harder to take the mower deck off, materials are of a lighter guage, and it is difficult to get to the fluid fillings and grease zerks.
If you're looking for something without these issues, then you should examine some tractors in person to make sure things like this are configured in a way that you prefer. The Cub 3200 may or may not have a better setup than the X540. The only way to know for sure is to crawl around one, have the dealer show you how to remove the deck, where the zerks are, etc.
The mower deck arrived badly out of level and scalped the grass.
Dealer prep issue, can happen to any brand. This shouldn't be held against the tractor itself.
The unit stalls when I engage the PTO.
This can happen if the engine hasn't warmed up enough, or you're engaging the PTO at too low a throttle. Could also be that the deck has an issue causing it to be harder to turn than intended, like a bad spindle, no grease, etc. etc. In any case, your dealer should sort this out for you.
The powerflo rear bagger repeatedly falls off it's hitch.
Again, this is a dealer setup issue. Either he didn't install it properly, or something has since broken.
And this weekend after cutting the grass, it just stalled after 2 hrs. Now I cant get it to run for more than a few seconds before it stalls.
This could be something as simple as a clogged fuel filter or a clogged fuel tank vent (usually a hole in the gas cap). You should have the dealer figure this out for you before you give up on it. If it's simple debris in the tank vent, then he can show you what to look for so that you can check it periodically in the future.
For the $8500 I have in it, Im not happy. I just want to hop on my tractor and cut my grass, so that's why im looking at alternative mowers.
I hear you about the money. You spend a lot, you expect a lot. But you have to remember that these tractors aren't Toyota Camry's. Even on the best machines, things can go wrong. This is where the quality of a dealer really comes in to play. You should give your dealer a chance to fix the "bugs" in your X540 so that you can at least get a feel for whether these issues are systemic, or just one-offs.