I can tell you that any of the Benardella roses (Show Stopper and Power Point) are bred specifically for exhibition form, are not stingy, and are at least hardy to my borderline zone 7a/6b area. I would expect that they are hardy throu zone 6, but I can't guarantee.

powerpoint and showstopper should do good on the show tables Horizon roses is a review of the newest exhibiton roses if you don't have one you need to get one i think you can order one from (ars) American rose society Good luck

Horizon Roses is an independent publication, it is not published by the ARS.

Here is a link that might be useful: Ordering Horizon Roses

I always order Horizon Roses and find it's information invaluable when selecting roses for my garden. For my $10, it is the best publication out there.
John