I have a Perfexxion system which is perfect for me...I have my embroidery machine on one end, my Janome 6600P in the middle and a couple more machines on the other end. Downside is that it's rather pricey...upside is that I needed the space.
I have also got a couple of friends who have the Gidget (spelling??) table and they really like those. So I guess it just depends on what you need...
Good luck!