I like different types of Ancistrus.
Like Ancistrus ranunculus, sp. cf. hyplogenus, and Ancistrus sp. L107, Ancistrus sp. L183. I also like Hypancistrus and Baryancistrus
Hypancistrus and Barryancistrus cats are generally more colourful than ancistrus but are always alot more expensive. Both will mix well in community aquariums providing they are looked after and fed well.