It's not on the OP's list, but since you mentioned the Transit Connect I thought I'm mention the Nissan NV200.
I find most people haven't heard of them yet as they've only been available since 2013. That does make them harder to find used, but they are pretty cheap to start with if you stick with the base model and since the upgrades for the SV are only cosmetic there's no NEED to go there.
The NV200 has a little more length than the TC. The one I picked up is a 2013 that had been converted into a mini-camper not 6 months before. Sadly, I had to tear out all the previous owner's hard work to convert it back to a work van, but it should have enough length for you to lay down. It doesn't quite have the height of the TC, but it's not far off.
I've put about 2500 miles on mine so far and find I can manage the EPA numbers of 24 city/25 highway pretty easily even with steel shelving and tools in it. The key is not to push it too hard on the interstates as it has the aero of a brick. I had to slow down to 75 instead of my regular 80 cruise to get those numbers.
I personally find the CVT to be awful around town/off the line, but it's not so bad once you're moving. But let's be honest: any vehicle in this class (which really only consists of this and the '10--13 TC) is going to be a pretty poor drive if your comparing to your Porsches.
The styling isn't it's high point. And it's performance certainly isn't either. But it's very high on utility, gets best-in-class mileage, and can be had brand new starting at about $18K (base MSRP is $20K, but I find them advertised starting in the 18s). And hey, you won't see yourself every day.
I have some pics of how the camper set-up was done in mine when I picked it up, but I'm actually at Overland Expo now and don't have the bandwidth to upload them.
In the mean-time, here's the Nissan website:
http://www.nissancommercialvehicles...=0.245852937&gclid=CISLhambsr4CFRWRfgodKQkA6w