In reply to Ramblin dave:
Thanks, looks like loads of good stuff here.
The Southern Carpathians have been sort-of on the list ever since I read that slightly fluffy Nicholas Crane book where he walks across Europe - they really look rather nice. Likewise the Picos, although the temptation there would always be to sack off the walking and go climbing...
Lots of other stuff to mull over, too.
Re Iceland, what are the best bits for walking? The Laugavegurinn? Or are there better places to go?
Thanks again!