First priority is budget. A very close second is who will be maintaining and repairing it. Third is the volume of use the machine will get.
Most all commercial machines from known companies will produce excellent coffee if fed high quality beans, properly roasted, which are fresh, and freshly ground in a quality grinder.
To a beginner in the coffee business I would say, get a job in a coffee shop and stick it out for 6 months. The job should be at a real coffee shop with real coffee machines. That immediately rules out Starbucks and other ventures that use super automatic machines. If you are striving for the highest quality espresso possible you will need training. There is far more than grind, dose, tamp, push a button involved. For example. If the espresso is not quite right, is it the grind? Dose? Distribution? Water temperature? How do you tell?
Four to ten ounces of milk, whipped cream, and chocolate sauce will cover a multitude of sins in an espresso, but for exceptional cappuccino and latte it takes knowledge and experience.
If you are serious it would have been great to have you attend the SCAA exhibition in Houston as there were a multitude of training opportunities available.