I am still a rookie, but I can tell you this....brace yourself. LOL
Still, the La Marzocco Linea is the workhorse of the industry. The LM GB/5 is a big hit. Personally, the FB/80 I used at Counter Culture's Training Center is by far my favorite. Just love it.
What am I going to put in my shop? Since I am also having to consider cost, probably a Nuova Simonelli Aurelia, 2 group, without the smart wand.
Chris Deferio has one in his new shop in Muncie, IN. Vecinos is the name. Love that shop. Hope to visit it someday.
LM 4 group Lineas are plentiful and cheap. Starbucks used to have thousands of them, and they sell cheaper than 2 & 3 groups used. You need a lot of counter space to use them, but if you have to steam a lot of milk, having that huge steam boiler will come in handy.
I hear that's why Sbux used 4 group machines, because otherwise they couldn't get the steam throughput they needed for all the 20 oz lattes they served.
Do you realize you mentioned almost every big name out there? I will also be looking for a new (or used) machine fairly soon. Can you suggest a machine around $4,000. There will be a fast paced drive thru, mostly lattes and caps, if that matters.