Wow, thank you all for your replies! I went over to my local sewing machine dealer, and he had the Gidget table that looked pretty good, so I ordered one, with 2 inserts. One for the Pfaff and one for the Janome. The two tables look very similar and seemed sturdy. I wont be taking the machine out of the table much, and my mom doesn't make ginormous quilts, so it ought to work out quite well. I noticed that the Gidget table has about 6 inches of room at the right of the table that you can put your "stuff" on, which is more than my Horn cabinet has!
It's good to have friends who know the answers to my questions
Kathy