I have 1 and two halves. I have a Paterson/Philips PCS 2500 for sizes up to 6x7 and a Graflarger cold light back for my Linhof for 4x5", which I use on a Bogen copystand that was originally for a 22A Special enlarger (I thought I would buy a "real" copystand at one time, and then realized that Bogen sells precisely the same piece of equipment as an enlarger base/column/carriage unit and a copystand). I just sold my old 22A head to someone who wanted it for the negative carriers and parts.
No room in my Manhattan apartment for more than that!
Update, January 2006--Well since my original post I found an Omega D-II that fits in my dark/bathroom and sold the Philips enlarger. I still keep the Graflarger for some future use, maybe if I'm spending a summer or semester away from home.
Update, April 2012--Holding steady with the Omega D-II. Graflarger still pretty much lives in the closet.