Regani are less commonly found in lfs than some of the other species, but are often available to stores, you just need to inquire. They tend to be a bit less aggressive than say the bifasciatum... more like a synspilum in temperment, but of course, this is a blanket statement.
For a fish that will occupy the upper areas of the tank, obviously an arowanna would be a good choice. Peacock bass tend to occupy the upper middle when larger, but are difficult to obtain large and at a reasonable price. They are difficult to get off of live food when small, unless you buy them from someone like Jeff Rapps who claims to condition his bass to pellets.
