[surly Bill]

I saw a carbide tooth blade the other day, not sure of the TPI. I swear by the expensive carbide sawzall blades now.
I'd go with the 21 myself.

 

[surly Bill]

0.95 Amp Electric Body Saw

Amazing deals on this 120V Electric Body Saw at Harbor Freight. Quality tools & low prices.

www.harborfreight.com

If you need an excuse fro an extra tool, this wins, or ones like it, i cut from underneath, 5 minute job max, including drilling holes for corners!

whoa, that's only about twice the price of a carbide jigsaw blade! For a whole tool! The design of it would definitely be easier to use than a jigsaw.