First check that you don't have a 23" front rim. If you do, post again because you'll need some different advice....
Assuming you have the standard 21"/18" set-up, I would go either for Dunlop 756 intermediates or Maxxis IT. The former are the performance "gold standard", while the latter last at lot longer and are far more economical. IMHO you are over-thinking the tire selection thing particularly the weight issue and 19" approach. However if money is no object get a 19" Excel rim drilled and laced up and run a Dunlop 756RR like the factory guys.
http://www.dunlopmotorcycle.com/tirecatalog_category.asp?id=4http://www.maxxis.com/products/motorcycle/find_your_tire.asp