i've got an Icon Motorhead leather jacket that I like a lot.
It has a fair amount of venting and is comfortable in warm weather as long as you are rolling.
The problem comes in behind a full fairing with limited air flow, I cut down my windshield to solve that.
My take on leather is that you will like it more on a naked Bike.
I have the all Black, it took awhile to break in as most leather will.
http://www.revzilla.com/product/icon-motorhead-leather-jacket
I'm 6'4" 225lbs XL fits nicely.