Bought a secondhand ezytrail tent on a locally built trailer a few years ago.
Never had issues with it. Takes about 10 mins for hubby and I to set up. We watched the original owner - bloke of about 75 - set it up by himself in 6 which we still can't beat.
Like you said, the main tent area is much bigger than other brands but that is the reason why we like it so much, we've never had to use the annexe once, nor did the original owners.
Greg (previous post) sounds like he's got a newer ezytrail tent than us re: being able to set up by himself...whereas with our older tent, you would need a couple pairs of hands to initially rotate the tent over and lay the floor out, but the rest you can do by yourself.
Like others have said, work out the things you must have and take it from there.
We nailed our dream camper down to an aussie jay big red/crusher (aussie built) which ticked all the boxes (we didn't buy it though as we got a different camper at a ripper price instead - right time, right place thing). We went to the factory and got them to set it up, then had a go ourselves etc. good thing about their tent is that its super easy to set up for one person (well it was a few years ago). Quickly sussed ebay and there's one at the mo for 5500 here in melb but don't know where you are and if its an easy visit to inspect. disclaimer - I have absolutely no affiliation with the ebay buyer nor camper company so obviously research yourself.
Maybe consider secondhand aussie stuff if its within your budget and has everything you need etc?
Good luck and cheers!