Your bench height depends on what you are working on and how you are put together. I am 6'0", but I have longer than average arms. My main woodworking bench is 32" which is just right for planing boards and hand cutting dovetails, but a little low for hand crosscutting boards. I have a 12" high metal working vise on the corner opposite corner from the woodworking vise and it is just right for me. For large cabinet assembly I set up my torsion box table top at 20-24" which allows me to reach top and bottom of the cabinets. I have a 42" high bench I use for detail work and I built a "fine detail" bench (a box) to go on top to bring the work up to almost armpit level. Extreme, yes, but it works for me. I built the countertop around my shop sink to be 40". I use a fiberglass mopping sink, so having the top that high allows me to reach in and remove things with my arms with minimal bending over, which my back thanks me for.