If you believe all the stories about raingear posted on this site, you might get a picture of all these people wearing their rain jackets on hot, humid days, sweating buckets into their rain jackets and expecting the jacket to do all the work of evaporating the sweat. No jacket, not even an eVENT one, is completely up to this task. Again, if you believe people's stories, the eVENT will keep you a little drier than the other laminates will, but it's not cotton. You're still dealing with two layers of ripstop nylon and a waterPROOF membrane.
There's also the issue, as someone mentioned, of various individuals' frame of reference. For instance James posted a story about how he was wearing eVENT pants and a Gore-tex top and how his upper body got more overheated so he concluded it was the Gore-tex that was at fault. I would seriously question this conclusion. The upper body generates more sweat and has more surface area than the lower body. Thus, it will always feel hotter than the lower body. I don't mean to pick on James in particular. I'm just saying we all have our own anecdotal evidence to support our opinions, but anecdotal evidence is not the same as empirical evidence from a controlled experiment (for various practical reasons in this regard--who has the money to buy every type of raingear there is anyway?). Again I don't mean to pick on James in particular, but probably 95% of the people who post to this forum, myself included, form our opinions from anecdotal evidence, so it's always important to keep these things in mind.
If you want my recommendation, just get some raingear made of Goretex Paclite. It's proven its merit for me many times in terms of breathability and breathability, is generally lighter than the eVENT gear, and not as expensive as eVENT either. Moreover, if you plan on sweating buckets into a rain jacket, at least there are some Paclite jackets available with pit zips.
I use an OR Zealot jacket (no pit zips) and OR Celestial pants as my main raingear. On shorter trips, I'll use Driducks pants for the weight, but trailside brambles and such can tear those to shreds so I don't like to depend on Driducks for longer hikes.