I think I'd go with the centennial. Its nice and citrus for summer. I made a lawnmower beer last year with centennial and it was awesome.
As for temps go as cool as possible. If you can, try to bottle lager after your beer is carbed. Essentially refrigerate all of your beer. ~6-8 weeks
When you ferment warm, the beer tends more fruity so a centennial would be a good match.
