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Calsap is white with a burgandy blotch.
Calsap - 4âÂÂ, -25F. A very hardy plant with lavender buds that open to white flowers, boldly blotched with burgundy. The smooth, oblong, emerald-green foliage forms a dense cover.

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A. Bedford is very light lavender with a purple blotch.
A. Bedford - 6âÂÂ, -5F. This large growing, vigorous rhododendron tolerates exposure to full sun. Its funnel shaped flowers with ruffled edges are pale mauve to lavender-blue with a distinctive dark blotch. This is a good selection for a background plant.

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Peter Alan is light purple with a dark purple blotch.
Peter Alan - 4ýâÂÂ, 0F. An outstanding rhododendron with glossy, deep green foliage that densely covers the vigorous grower. The broad, upright plant has purplish blue flowers accented with a darker eye.

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Jonathan Shaw has a purple flower with a dark blotch.
Jonathan Shaw - 3.5âÂÂ, -10F. Large, vivid, violet-purple flowers have a strong purplish-red center and prominent black flare. The wavy edged blooms are held in trusses of 19. Matte green foliage densely covers this compact bush.

Here is a link that might be useful: Hybrid Rhododendrons

Wow thank you so much! The Calsap is the one I have seen that intrigues me. The link is very helpful too.