On the Dragon:
I have run the OEM F1's with great results.
I have run new F1 A/S's with great results.
I have run Nitto Invos with great results.
This year I will be repeating on the Invos.
What I have found is that the summers will be great, even in the cold - ONCE THEY WARM UP!!! Year 1 I had a sincere pucker moment when the first turn of a morning run (read like 40 or so degrees) was a little too quick for the not warmed up tires and ESP did some amazing magic (yep, I had ESP on for the first run of the day...) to get all 4 wheels back on pavement... That was the only issue I had, but my ass almost ripped a hole in my seat.
The year that that happened we were staying at Topaco, which is just down the hill from the Deals Gap Motorcycle Resort, so we were a lot closer to the Dragon proper with less warm-up time. Once warmed up, everything was stellar all over again, but you need to be aware that they need that time.
Where we are now, at Fontana Village, we are a few more miles from Dragon proper, but 28 is still PLENTY of fun, so you need to be mindful of that area as well.
IMO - for the Dragon summers are the most fun, but you have to baby them for the first few minutes...