There are a number of articles searchable on this site that lead to the conclusion that eVent is best.
Wild Things is a small manufacturer of climbing apparel in N. Conway NH that uses eVent.
If approached in the right way, they might be willing to sell you a few yards of the lighter denier material with the eVent laminate.
But it would be expensive. So, wonder if it would not be cheaper to just purchase one of the lighter denier Integral Designs jackets ready made.
There has also been much discussion on this site of the lighter Membrain Strata used by Marmot, but so far as I know, no comparative testing as has been done with the Strata and eVent. A number of posters on this site have felt subjectively that Strata is more breathable than the Goretex, however.
I am a little leary of the manufacturers' claims, and tend to wait for some good test results before investing a lot of money. Got caught on the open Presidential ridge near Mt Washington in an Epic jacket in a sudden high wind hail and rain storm that turned the jacket instantly sopping wet from the inside out. Visibility was less than 10 feet. If I hadn't had a hooded Goretex pulloever from REI in my daypack, I'd have been in very bad trouble.