sunny,
no need for sumps. they are more personal preference than anything. easy to hide equipment in them, i.e., heaters, pumps, skimmers, etc.
i keep a 120 oceanic with tons o live rock, berlin hang on skimmer and an emporer 400 with bio wheels and carbon pads. bio wheels are not really needed as most bio occurs on live rock anyway. nice to be able to run carbon pads, though.
lastly, i prefer to do my work standing up not kneeling or on my hands and knees. to each his own, right?
good luck.