This saw on steroids is the Makita 16-5/16-in. circular saw (model No. 5402NA). It’s huge! In fact, it's so big that you can cut 6-1/4 in. deep at 90 degrees and 4-3/16 in. deep while the saw is set at 45 degrees. You'll get the best results and save wear on the saw if you precut a kerf with a standard saw first. That way the saw will have 2 in. less depth to hog its way through. One of these will set you back close to $800.
If you have big wood to cut that calls for closer tolerances than you can get with a chain saw, it’s time to enter the big leagues of circular saws. Every log or timber frame builder uses saws like the ones shown here. These beasts are expensive and rarely available for rental, so we’re talking about a big investment if you need one to build your dream cabin in the woods. They may look intimidating, but you’ll feel comfortable with any of them after a few cuts. You can find and order these bad boys at many online tool suppliers.