Check out some of these links for some good ciruits, also I would keep strength and circuits atleast somewhat seperate. For example do your main strength training then a circuit or do them on different days. For example Ross Enamaits II book goes like this (it's 4 days on 1 off):
*Circuit (technically a challenge but same concept)
*HIIT (Sprints)
*Strength Training (Alternate weekly from Max effort to dynamic effort)
*GPP to work lactic acid back out
*Rest day
But try some of these circuits:
http://www.rosstraining.com/articles/themagic50.html http://www.rosstraining.com/articles/noexcuses.html http://www.rosstraining.com/25reproulette.pdf http://www.rosstraining.com/sequenti...echallenge.pdf