I have tried the lot (even fell-running boots) and swear by lightweight leather. I have low topped Brasher boots that feel like feathers, making walking a real pleasure - and have never given me a blister, or any other problem.
I do have high arches and insteps, though - and have to be careful about lacing. I wonder if that may be part of your problem? Brashers do have an alternative lacing system (see their site
http://www.brasher.co.uk ), but I swear by elastic laces (from
http://www.furthers.com who do mail order), and taking time to put the boots on and get the tension right. I do the whole liner sock and wool sock routine, so my one luxury in my 6Kg pack was a shoehorn to keep the socks from wrinkling when the boot goes on.
If it is just one foot affected, it could be that one is a different size, and you might need some form of insert?
Post a photo of your poor feet so we can see the problem!
Best wishes,
Pip
Edited: so that Brasher link now works WM