pref leather in the summer heat of central Florida. No way. That jacket gets put away in April.
Olympia or the Vanson mesh are both good choices for mesh. Also Rider mag. this month has a review of quite a few mesh jackets. Have seen the Vanson and don't think you can get much more airflow with a decent level of protection. No experience with Joe Rocket.
Just remember the more hot airflow over your body the more water loss you will experience. Got to keep drinking LOTS of water. Would suggest a camelbak or something similar to keep away the dehydration. Don't want the "bear to grab you" while you riding.
Also shirt like underarmour are good choice, long sleeve will acutally keep you comfortable.
Also this is a good read for other suggestions
http://www.advrider.com/forums/showt...ight=mesh+gear