I've got a pair of Meindl Magic Air thingy's, and forgot to take my boots to Snowdonia with me. I did Pen yr Ole Wen, Carnedd Llewelyn, and Carnedd Moel Siabod in 'em. There was some reasonable scrambling, which these coped with well, even though the soles aint sticky at all! I would recommend something like that, plus something with ankle support and waterproof, 'cos these aint.
Some lightweight boots, with Gore-tex lining. Maybe.
Sorry that was quite indefinative. Just that enkle support is nice for scrambling, but not always neccesary.