Hello there,
I think your best move would be to have your feet scanned, so that your chances of buying the wrong shoes for you would be highly minimised.
I went to a "Sweatshop" in London, and there, I learnt invaluable information on the way my feet move and the kind of shoes I really need.
I don't know whether you live nearby a branch. Browse their web site, www.sweatshop.co.uk , where you will find a list of all the branches in Uk. the scan is f.o.c. and it's soooooooooooo worth it!!
good luck