Skil saws available for most applications.
This Makita beam saw ($50/ day) will cut up to 6" in one pass. Great for beams and larger timber.
For 4x4 cutting this Skil saw with a 10" blade ($30/ day) is the way to go.
A regular 7 1/4" Skil saw ($20/ day) will handle most day to day needs.
A regular 7 1/4" Skil saw with a Hardie blade ($25/ day) will cut cementious boards all day long.
A Skil saw with a 7" or 8" steel cutting blade ($30/ day) will handle most steel cutting needs.