i am currently using:
antivir = avguar.exe (12,072k) + avgnt.exe (4,120k) + avwupsrv.exe (2,220k) = ~20MB
kerio 2.15 = perfw.exe (5,004k) = ~5MB
very low resources.
stay away from zone alarm, or the newer kerio if resources is a concern. they hog a lot. and for useless features that...