A bigger hog than Candle's Omegamon? I worked for that outfit for six months, before I figured out that performance monitoring software was a shell game that large companies exploited to the hilt with the three major players: Candle, BMC, and CA.
'sar' generates =tons= of stats. Actually, it generates more stuff than you can usefully use, and it is almost unnoticable when it runs. Granted, those other programs are probably doing some things that sar isn't, (like process monitoring), but they seem quite heavy for what they do.