Best? I dunno, but I like these, not in order.
Marineland Magnum 350
Renas XP1 or XP2
Marineland C-220 or C-360
If you want the floating in air look, cant go wrong with a Magnum 350 with Micron cartridge running 24-7. However expect to do cleaning about 1-2 weeks depending on stock. If you only want to be cleaning once a month or so, go with either the XP series or C series.