In reply to Merlin: I found that if you don't wash it often, then it can wet out and you seem to sweat more in it. Can't say I found it leaked any worse, even sitting for lunch in puddles.
eVent is a massive jump in breathability from Goretex XCR, which I would guess that is what most people have/had when they made the switch to eVent. I had XCR, moved to eVent and then on to Proshell. IME Proshell Goretex is not that far behind eVent and I sweat like a monster. I wouldn't discount Proshell - unless maybe all the people above have moved to eVent from it? I'd be interested to know myself. I went to Proshell as I wanted the Raptor hood, I've come to the conclusion that a decent hood is far more important when it comes to keeping dry than what fabric you use.
If you're serious about breathability, then just make sure when it's not actually raining, get the shell in your bag and wear a windproof instead, something from Montane or the like. It's the only thing that works for me.