My neighborhood subdivision is looking at replacing our mailboxes. The current mailboxes have 4 by 4 posts and 4 by 6 side arms. What is the best tool for cutting 4 by 4s? Table saws, radial arm saws and circular saws specifications list 3 1/8" as max cut. Mitre saws look like a possible solution. The guy at Lowes' said a reciprocating saw was best, but they don't appear powerful enough. Thanks for any help.