Thanks for your replies.
I agree about the plastic mount - that is probably the one thing that is holding me back.
Al
If you use filters, the 18-105 is better than the 18-55 as the front element doesn't rotate on focussing.
Plus, the extra range is nice.
Paired with a 35/f1.8 it's a great cheap/light combo for travel IMO.
Well after another day's pondering I've decided against the 18-105 - because of the plastic mount. I feel I would be constantly worrying about it and that would cheese me off.
Al