I dont think a single group commercial would be out of place at home, that is my longer term aim and Im the only coffee drinker in the house. I would be very wary of any second hand commercial machine on ebay.
If you entertain regularly and go for a domestic machine you should really only consider HX models, which rules out the Piccolo & Zaffiro. The Expobar Office would do the job, although you may want to search for previous threads on this machine. From memory there are reports of it running pretty hot. You may want to throw the Nuova Simonelli into the equation, I use one in the office and am very happy with it.
If you can afford a little more I would highly recommend considering the current deals being done on Diadema machines by several sponsors. $2K can get you a Junior Plus Semi-Auto or Lever machine. Bargain.