I am sure you know this but those Nespressos are not espresso machines at all. Basically they are a nicer k cup setup. 
 

I have been roasting beans for many years so if you are that geeked out already a Gaggia is pretty much a great starting point. The rancio Silvia being another good line to look at. 

You also need an excellent grinder and the sky is the limit. The “least” grinder that will do the proper job is a Baratza Virtuosa. I own 2 Virtuosas, both purchased used. Great mid level grinder and Baratza is a fantastic company on the support side as well.

Another Rancilio Silvia and Rocky grinder owner here. Great machines. Totally hands-on espresso maker. Kind of like spinning vinyl with a completely manual turntable. You gotta love it.

It doesn't get any simpler than this:

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Rancilio Silvia Pro X.  Dual boiler machine.  Easy to use.

My favorite is the Olympia Cremina not inexpensive but they have been making since the 1960s and can be found refurbished under $2k. It is one of the smallest top tier machines available.

https://www.cerinicoffee.com/products/olympia-express-cremina-espresso-machine-made-in-switzerland

or for something completely different the 9barista 

https://9barista.com/products/9barista-espresso-machine-mk2