If you're used to the sweatyness and having the extra armor on thats no problem. One of the things that I enjoy is being able to take off the jacket with all the armor for proper ventillation quickly... Joe Rocket jackets do a great job of making mesh jackets. Motorcyclehouse and you can find...
You gotta make sure your tank bag has good magnets... and protection. I add an extra soft layer of microfiber.. just to make sure nothing bad happens or scratches up my bike.
http://www.motorcyclehouse.com/motorcycle-tank-bags.htm
Also be sure to clear the bottom, it can pick up all kinds of...
I would recommend going on eBay. I've had some success on ebay finding hard parts and getting a great price on it. Also check out www.revzilla.com www.motorcyclehouse.com just in case they carry it too.