This may be a little late, but here ya go...
I too used a hole saw for quite a few tables, and like already mentioned use a corded drill.
Another option you could use, which I have switched to, is a Jasper Circle Jig (small). If you have a router, remove the base plate and attach the jig. Using a straight cut bit in the router this jig will cut perfect circles from 1" to 7 1/2" in 1/16" increments. An awesome jig for the money!
Seen here at
woodcraft...