Jeanne LaJoie
A breeder of miniature roses told me that you can't get any better than Jeanne LaJoie.  While the blooms are small the plant can be big.  I've seen a great picture of it climbing a garage.  The blooms are very sweet and beautifully formed and occur throughout the season in great numbers.  Bred in 1975 by Sima, hardy from zone 5.