personally i would go to go outdoors and pay £200 for both trousers AND a jacket. and i would expect them to last just as long as anything fishing related. surely berghaus etc sell 10 times the amount fishing related companies do. goretex is goretex mate. i would spend another 50 on some decent thermals.
kitted out for years at a fraction of the cost of daiwa etc. i would say that the daiwa stuff is up to the mark though. but then again they dont actually make it. shame they dont outsource the rest of their gear !!

Give Sandra a ring at Halkon Hunt and get some made to your exact size they will be cheaper than Daiwa or Sensas after all she is the one who makes them in the first place.

Halkon Hunt will make some to measure for £360ish for a 3/4 coat and bib n brace in any colours/design you want.

there is a van den eyed set on maggot drowners now for about £150 m8

There is a gore-tex bib n brace on the US Cabelas site for $110 around £70 in our money,loads of windproof fleeces/jackets+gore-tex jackets/coats as well.