As an Electrician by trade, A 100 amp panel should be plenty. You can get one with 20 or 30 slots. If your shop is 1,000 square feet or more I would recommend a panel with 30 slots, otherwise 20 would be fine. The size of your subpanel would also depend on the size of your main panel. You can't really have a subpanel the same size or bigger than the main panel that is feeding it.
Thanks for the info. My shop is about 800 sq. ft. Current panel has 12 slots I believe and a 12 slot sub panel should be plenty for my needs I would imagine.
http://www.acetoolonline.com/JET-JJ-6CSX-6-Closed-Stand-Jointer-Tilting-Fence-p/jet-708457k.htm
Can you answer this question for me? Take this tool for example, it can run on 110 or 230V. It will draw 6.5A @ 230V is there any reason I cannot wire the machine for 230V and attach a 20A plug on the end of it to plug into a 240v 20A outlet?