nitpick wrote:For the price of one Vibiemme, you can get three Silvias. Now how much coffee can you make at a time?

For a lot less than the price of a Silvia you can get a brick which makes a much better paperweight than Silvia, and costs a LOT less. Heck- you could probably build a BBQ with the bricks you could get for the cost of a Silvia.
The Silvia is a toy compared to the three machines the OP is considering. It is even less valuable when entertaining a group of people. I can say that because I have owned a Silvia and now own a Vibiemme Domobar Super. I have had the chance to compare the two. When the Vibiemme was on the way to me I considered keeping the PID'd Silvia, but after the first two or three drinks from the Vibiemme, the Silvia was for sale. Two different worlds.
Current new prices:
Vibiemme Domobar Super manual in black: $1700 (used $1000)
BZ07spm - $1099
BZ02S - $950
Based on the quality of the grouphead alone, the Vibiemme would be on the top of my list. But as I mentioned earlier, it must be checked out, or maybe get a three day return option in writing. Alternately, give your husband a "Gift Certificate" and allow him to check it out before deciding if he is capable of doing so. Or maybe the seller can deliver, set up, and allow your husband to use it before deciding...
Again, I have not used the Bezzera machines, and I do own the Vibiemme, so take my prejudices into consideration.