What type of substrate do you plan to have, and how much maintenance (water changes) do you want to do? Panaques, being wood eaters, produce a lot of saw dust/crap, so you need a lot of filtration and water changes (and going bare bottom makes cleaning up after them much easier). But they are some of the most handsome plecos (the "Royals," e.g., Panaque nigrolineatus L190; Panaque armbrusteri L27).
Other options, for size and color would be L14 Goldy pleco, and L114 red-tailed sternella/cactus pleco. These are more meat eaters, so they produce less waste relative to the Royals.