Adonis, L200, Queen Arabesque L260, L250, Blue Panaque. Actually - I love them all and these are just the first to come to mind. I can spend days on Planetcatfish's Cat-e-log just drooling.
L046 is kinda overrated, having the solid true black and white is cool but other than that it's not too cool when you never see them. I've owned a group of 6 and don't think I ever saw them.
L134 kinda gives the L046 a run for the money.
L025, L095 or other giants would be my fave, I like the high humped back and the pinecone scales.
Albino adonis, Xantos, LDA105, L273, L25, L24, L282, L46, L14, L427, L600, and L114. I know it's a long list but I've invested in tanks and groups for breeding all of them I don't think I have to narrow it down further.