not sure on specifics for high contrast, but i've seen some outstanding animals from Gus Rentfro of Rio Bravo Reptiles... those stick out in my mind more than any others.
I know someone was breeding for pink... forgot who.
Others working with Argentines are Mike Greathouse, and then mostly for the T related stuff, Bob Clark, John Mack, Jeremy Stone, Pete Kahl and myself, amongst some others I may have forgotten.
Best wishes!
Thanks, Joe
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Thanks and take care - Joe Rollo
'Tis not the stongest of the species that will eventually survive, nor the most intelligent, but the one most responsive to change' Charles Darwin