In reply to SandstoneYorkie22:
I've tried various ways round this conundrum over the years and ultimately decided its all a bit of a compromise. Weatherproof trousers seem heavy, restrictive and, aren't truly waterproof. Goretex over-trousers are expensive and can be overkill for days when its just a bit miserable/windy.
My current set up is ME Kinesis trousers (they're great, seriously, just buy some) under a pair of ME Lhotse Goretex Pro overtrousers. The Lhotses come without braces, but I never really felt they stayed up that will with the built in belt, so I've added from braces to them which is a massive improvement. I really like this combination and would happily buy the same again if I had to. Ive also worn the Lhotse's in warmer foul conditions with lighter trousers or (heaven help me) merino leggings underneath. They seem to be pretty hard wearing and I've not managed to stick my crampons through them yet.
In the past I've had Rab Winter Torque trousers and paired them with some cheaper goretex overtrousers to pull over as necessary. I've still got the Torque trousers and wear them in changeable conditions, they're not as warm/breathable/stretchy (the stretch could be the cut/design) as the Kinesis but they seem to shrug light rain off pretty well and don't wet out.
Appreciate none of this is particularly budget, but I'm hoping that I can keep what I've got for several years and hopefully it'll work out as a more reasonable number of £'s per year in the long run!
Hope that helps,
Dicky