If you're dealing with lumber at all (or even PVC), it also pays to have a good miter saw, and right now, one of DeWalt's ...

One shopper even called it “an absolute treasure” because “right out of the box," each cut was "dead on.” This double bevel compound miter saw hinges both at the plate and the saw neck.

Circular Saw: Up to 3,700 RPM. Cordless 6 1/2 in. Circular Saw: 50° Bevel Capacity ... Charger: Compatible with all RIDGID 18V Batteries. 100% Compatible: Works with all RIDGID 18V Batteries ...