I would stick with co-dominate morphs as they are faster to produce and much less complicated genetically.
As for the exact morph that is really up to you and your personal taste.
I would suggest these but without knowing your price range it is difficult.
Pastel
Spider
BEL complex (Mojave/lesser/butter)
Black pastel or cinnamon.
As for breeders I would stick with reputable breeders for your first morph
Any of these will be fine:
http://www.jkobylkareptiles.com/
http://pythonregius.com/
http://www.ralphdavisreptiles.com/