I use a circular, table and a chop saw. The table saw is normally used for ripping, the circular saw for cutting large plywood sheets and the chop for everthing else. The chop saw gets the most use.
A great, and cheap, strait edge is to use a 1x6 nailed and glued on top of 1/4" plywood, pegboard, etc. Run your saw down the 1x6 cutting the 1/4" stock and you have a straight edge/guide. The edge of the 1/4 will be the exact cut line. Line it up on your plywood, clamp it and cut. Perfect straight cut every time :wink: I only have a 4' long one, but you could also make an 8' for long cuts. My total cost for the guide is about $3.00.