My vote for 4' wide is of course dependent on having room to walk around the table on all sides. My worktop is a 4 X 8' sheet of tempered glass that I got from a store display warehouse sale for 100 bucks. It is laid on a sheet of 3/4 in plywood which sits on two three drawer cabinets that I got from home depot. This provides drawer space and support. The glass surface is easy to clean and can be scraped if (when) you drop paint or glue on it. you can tape to it also. You can't push pins into it! <G> Four feet is too wide for working from one side, but I like having the extra width so that I can keep my current project on the "main side" and do something on the other side also.

It is also nice to be able to sit a plane across the table for alignment etc.

Size will ultimately be dictated by your workspace availability, and I've found that I adapt to whatever I have available.

G