Ben
I went to a camping show and had a good look over two of the models you have mentioned. I would seriously suggest you have a good look over them first and especially take note of how they are built. I did so, then went and found a secondhand aussie built one with a whole heap of extras thrown in for around the same budget as you are looking at.
Also get onto the camper forums and read up on some of the experiences and customer service feedback.
Steve