I've got about 20 sets, all restored and working. Many of them can be seen here (mixed in with my radio collection):
http://www.radiomuseum.org/collectio..._albrecht.html
Although I'm sure I'll collect a few more in the coming years, I think I've generally got more than enough. Lately I've discovered that I enjoy restoring sets for other people perhaps more than collecting more of them myself. All the fun without consuming more space when the restoration is complete! I've done about 30 sets for others in the last few years. Would hate to find room for those in my house!
Right now quite a few of mine are at SFO airport as part of their antique TV exhibit. I'm enjoying their absence from my house as much as the airport visitors are enjoying looking at them to burn up some time while waiting for their flights... Lots of room in the house at the moment, and it's kind of nice!