First, it seems like you are designing your criteria around a certain machine...i.e. you have already made up your mind
Not the case. As I said, I am actively asking people for other possible options as this is the only one I have found that looks like a good option. I love to compare stuff so even if it met most of the criteria I would be interested to see if it would still be a viable choice.
Second, without knowing your usage, it is difficult to give much advice.
I primarily drink shots with some cappa's occasionally. My wife drinks lattes. I would be looking for a machine where I could pull a shot or two for myself before work and some days make my wife a latte in the am. I drink drip at work. On the weekends I will be primarily pulling doubles for myself and only an am latte for the wife. This was the main reason the separate steam boiler was of interest since it will not be used most of the weekend. I want to be able to use a timer so that it is up to heat when I get up. Occasionally we entertain but I will not be pulling lots of back to back shots on a regular basis.
Based on my house setup it is going to be in the basement due to space constraints in the kitchen. It is in an area that really will be a pain to get plumbing to. I also do not know how long it will be this way. This is a chunk of $ for me so I want something that can be used in the future when I have a kitchen situation where I can plumb it.