L333 is nice, but I prefer L134. L260 is also a great choice. Both are striking, Amazonian, and max out around 4". Cons are that they are at the upper end of your price point, may not be readily available at your LFS, and can be a bit more shy. There is nothing more annoying than shelling out the money for pretty only to never see it. After a few months, they typically become more comfortable in their space and are much more visible. Although omnivorous, these guys skew towards the more carnivorous end of the spectrum. This could be seen as a plus if you need a cleanup crew to ingest the leavings of your other fish. However, if you are hoping for an algae-eater, these guys probably won't help you out much. Good Luck