In reply to Jeremy Foster:
No point going for hard shelled plastic (if that's what you mean) nowadays with all the great synthetic boots out there. Ie- scarpa phantoms etc...
Personally Id go for that sort of shoe over a leather pair, but if I were to go for a leather pair, id definitely want one with a goretex lining in, despite what some people say, they eventually let the water in without (even if goretex does too sometimes!)
As others say, its all down to fit, but getting a balance for comfy walking in and getting decent performance for climbing if you need a technical pair.