One issue with the tire size: If you plan to go 19" the sidewalls will be likely thinner than what you want them to be. If you go 19" staggered, the size will be:

F: P235/45R19 R: P255/40R19

I'm having trouble guessing what model the Dunlops will be, because Tirerack does not show any available for the front tire size. For the rear, I'm guessing you'll go with the Dunlop SP9000 summer tires. I'd go with the Conti's.

I just did an upgrade from 17" to 18", which is more conservative, but easier to find tires for. So far, the ride has actually improved somewhat, probably due to a handful of factors.