It might help if you told us how you intend to use the bike? Are you going to use it in conjunction with public transport or put the bike into the boot / trunk of your car?
I have owned 3 different folders and test ridden a good selection of other brands. I do like the Bike Fridays, particularly the Pocket Llama.
I currently own an S-Type 2-speed Brompton and I just love it. A really well thought out and engineered design.
There is another bike on my wish list that you could consider and that is a Pashley Moulton TSR.. not a folder, but it splits in half. I took one for a test ride and it was brilliant.
http://www.tsr.uk.com/bikes/tsr30.php