We just got back from the AQS Quilt Show in Paducah and are always impressed by these tables:
http://www.seweziusa.com/
I don't have one of these and don't really need one but I think they are neat and reasonably priced. They make the insert for each machine so I don't see why you couldn't buy an insert for each type of machine you want to sit in the table. It should be possible for any furniture that comes with an insert. You should even be able to do it yourself if you have the tools to cut acrylic.