I currently have 3 jackets that are pretty good
1) a Paramo Velez. I got this a couple of years ago for £120. It is absolutely waterproof and extremely breatheable, excellent in winter and it has side vents for when it is warmer. Fairly big and bulky though. Suffering from oil stains..
. Current full retail for Paramo coats like this is approx £200. They have an ebay shop that does ex-demo and seconds which I am watching like a hawk for a Velez Light in my size.
2) Gore Oxygen IV. This is the tiny, skimpy option. It is "aero" fit. It has a nice scoop tail. This is also genuinely water proof and breatheable but it is not as good as the Paramo. Excellent for when it is warmer. I think it weights about 150g in it's stuff sack. istr it was approx £110
3) Montane Stormrider. This is the medium option. It currently has a crash related tear. The 2 layer eVent fabric this is made from is fabulous but the coat suffers from lack of attention to detail
The pockets seem to also be some kind of vent, but they don't really work that well and fill with water. The zip is prone to jamming. I'm glad I got this as an end of line bargain for £100 and I will be fixing the tear asap. Worth considering if you see one.