So I have pretty much narrowed my searches down to these three tires based on searching through Tire Rack:
Hankook V12
Kumho Ecsta SPT
Sumitomo HTR Z III

Which would you go with? Any other recommendations in that price range?

Now is the really tough choice. Riding on factory staggered rays. Currently the car has 245/35r19 on the front and 255/40r19 on the rear. I know what it calls for stock. Should I keep the same set up? Go stock? Go wider in the rear? Should I try to match sidewall thickness from front to back? I have always put stock size tires on all my cars, but am really looking for some input here.

 

I have owned both Kumho SPTs and Hankook Ventus V12s. I preferred the Hankooks over the Kumhos overall, however I really dislike how soft the sidewalls are on that tire. They're one of the best bang for your buck tires right now though so I don't think you can really go wrong with them. We sell TONS of them with our wheels.

 

What kind of mileage can I expect to get out of these? I'm figuring I'll change the rears twice before fronts once

 

It totally depends on your driving style and whatnot. I'll put it to you this way though... I put the Hankooks on my car January 1st, 2011 and still have tread on them. I drive pretty slow, and I flipped them once because of my camber settings, but there is still a bit of tread on them. They aren't going to last as long as an all-season tire or something but I've gotten a decent amount of mileage out of them.

 

I have a lot of happy G35/37 owners on the Hankooks right now. Overall a great bang for the buck tire. Sidewall stiffness is really a subjective observation, but I haven't had any direct complaints about it. That's the one I would choose.

Call me when ready!

 

I have the Sumitomo on my car and love them. They really stick to the road when turning.

 

Any recommendations on the sizes to run?

 

Nobody has any input for tire sizes that look good and handle well with factory 19 rays?