A couple of years ago, I was lucky enough to be passing a decen outdoor shop just as the blackest cloud I've seen for ages went over and started empying itself. Of course, I had no waterproof jackey wit me so looked like I was in for a soaking.
Fortunately, I was in the market for a waterproof anyway so nipped into the Moorland Rambler ( any Exeter based members may know it already and the deserve the plug!) and did my normal thing with regards to specialist clothing - walking boots etc and started at the bottom of the range and worked up until I had found what I considered to be the best value for money. I can't remember the exact cost but IIRC it was around the £60 mark and is a Berghaus. No model name or number on the thing and it's probably been replaced in the range anyway but it's 100% waterproof, machine washable (handy if it gets sweatty - it's not a posh, breathable one) and comfortable. Zip front, 2 large pockets (into which it will roll for carrying), mesh lined so it doesn't sweat up too fast and IMO, worth every penny it cost me. No pitzips though but they're not essential IMO.