i wouldnt pay the high prices, like most sports stuff really
18 months ago i bought a set of 'buffalo' trousers and jacket and commuted in all weathers, they still look like new.
think the trousers were £60 and jacket £90, double zips and double stitching. mind you anything worse than a light shower and you soon get soaked! but thats why you can buy and all in one rain suit i guess!
i think more top end stuff is more breathable etc
i got a pair of boots aswell for £100 cant remember the brand but they were middle of the road, worn a bit but still loads left in them
i noticed some dirt cheap stuff in aldi's last night, had a look and it wouldnt last 5 minutes.
just my 5p worth