depends on how much you want to pay - good makes are The North Face, Berghaus, Sprayway, Craghoppers, TOG24, Jack wolfskin- a good waterproof that doesn't make you sweat will contain goretex or sympatex as part of the description, other brands that are worth a look are Didriksons, then you have Trespass, Regatta further down the price range. Millets do their own brand too which is a bit more budget.
If you are willing to buy on-line, then google these makes and look for the best deals, Craghoppers have their own site and I think they have a sale on just now.