I'd have to say Borneo Short-tail Pythons (Python breitensteini) with a close second Sumatran Short-tail Pythons (Python curtus curtus). (Ivory and Golden Eye Bloods are quite amazing as well as super stripe bloods)
I like Python brongersmai as well, but not as much as the other 2 subspecies of blood python(/short-tail)
After that it's a jumble of snakes
Fea's Viper (Azemiops feae)
Rhino Viper (Bitis nasicornis)
Woma Python (Aspidites ramsayi)
Bismarck Ringed Python (Bothrochilus boa)
Bar-neck Scrub Python (Morelia amethestina)
Wagler's Pit-Viper (Tropidolaemus wagleri)
Jumping Viper (Atropoides nummifer)
(New World) Vine Snakes (Oxybelis fulgidus)
Amazon Basin Emerald Tree Boas (Corallus caninus)
Clown, Bumble bee, Axanthic bee, Piebald, etc. Ball Python Morphs
Super Motley Boas
etc. etc.
