I snagged a Cortech GX Air 2 leather/mesh jacket on clearance a couple summers ago, and it's awesome. By itself you can barely tell you're wearing a jacket, and with both the waterproof and thermal liners installed, I think it's actually warmer than my leather jacket! Looks like the new version does not use any leather, but it's still worth a look.
http://www.motorcyclegear.com/street..._3_jacket.html