Paul ...
Firstly welcome to Myswag. I hope you enjoy your time on here , god knows alot of us spend far too much time on this forum. lol Although having said that it is one of the most helpful friendliest forums on the net.
To try and answer you question in a nutshell ....
I dont believe there is
one camper trailer that will tick ALL the boxes (well not within the budget of us "normal " folk)
If you are willing to go second hand there are some good bargains to be found on ebay, gumtree and free classifieds etc etc.
Are you handy ?? Doing some of the work yourself will also save you some $$$$. I have personally knocked up some storage units for under the CT, and am soon making a kitchen.
Soft floor VS hard floor ..... now this is a tough one and one that will spark many a heated debate on the forum. There are definate pros and cons of each model. Do your research and decide what works for YOU! A word of warning though, beware of the sales hype. Many salespeople at campershows will convince you why THEIR camper is right for you. Only YOU know what will work for your family ...
Solar, 240v, water tanks and toilets ......... with so many options available it can be quiet daunting. Again consider where you are likely to be camping. Are you a solo camper in the high country in winter? Or a powered site in a caravan park kind of camper ... ? Just because it has 1000 features doesnt mean it is right for you. Do you really need solar power if you only even intend to camp at powered caravan parks
Again, weigh up the options and figure what works for you.
My only advice to NOT waiver on the hitch or tyre quality, these are, after all, the only two things that hold your CT to the car and the road. An "off road" style hitch will make it easier to connect the CT to the vehicle in not-so-perfect conditions.
Im not sure whether that has helped or hindered your decision. But feel free to ask away here, it is a great forum with some very knowledgeable people.
Cheers Chippy