In reply to Little John:
> Thanks for the feedback. From what you are all saying I think I need to get two pairs of boot for walking and climbing.
IMHO there are boots that you can do both on the market that are worth a look. The Scarpa Jorasses and the La Sportiva trango extreme are both lightweight B3 climbing boots that I would happily winter walk and climb in. I am sure there are more. Or as you say get 2 pairs of boots and 2 sets of crampons!!!
You have a bit of a decision as grade IV and V winter stuff is on the cusp of needing specific climbing crampons and b3 boots.
Please be aware I am pretty much a punter so please take this advice with a pinch of salt.
cheers
G