I would suggest the first thing to consider is whether you want a fixed workshop saw or a portable saw for construction work. If you will never need to move it around then hold out for a mains powered 12" saw. You can cut 4" high miters on the vertical saving the need to tilt the saw all the time. For construction work I would probably opt for a battery powered unit. I think the only another thing to consider is dust extraction - they throw the stuff everywhere. The only answer is probably to build a canopy around the saw to catch everything.