admiral welcome to the board!!!!
This is my favorite subject currently

As a roaster I search out espresso machines for my coffee lab. I test coffee as my customers and their customers will use it.
Most high end machines are 2 or three group But you can get anything you want. Synesso have a 9 group at their both this year for SCAA. For a two group you should expect to pay $15,000 to $25,000 on for the higher end machines.
Now I am sure there will be additional machines added to this post BUT the ones I am listing are the top of the class.
I will list the machines and give my personal opinion of the top three.
First up is
Slayer.
http://www.slayerespresso.com
These machines are produced as ordered and can be highly customized in Seattle. Makes a very good espresso. Maintance has to be done with the jets and rings everyonce in a while. Customer service -Well the owner was two busy playing with the young hipsters making espresso at his booth than talking to the guy holding a check book big enough to buy 20 machines. So never less I was completely turned off on buying his machines. If I had to be a young cool hipster Slayer is not the company for me.
Second machine that is at the top is the
La Marzocco Strada series built in Italy.
La Marzocco Strada EP (Electronic Paddle) 2 Group - LM_STRADA_2GR_EP available from Espresso Parts
These machines make great espresso! an two group runs about $20,000. The machine that I know of is a production machine. You get what you get for the most part. Stradas have to have the brew groups rebuilt every 3 months, this comes form people I know that own them not the manual. Additionally these machines are built in Italy, good luck getting parts and if you need something in August forget it. Factories close for the entire month in August for vacation. With the brew groups having to be rebuilt frequently and getting parts from Italy this machine is one of the top three but buyer beware!!!! I was ready to buy a Strada since a competitor has one. After doing the research, no thanks.
Last is
Synesso Hydra (did you see the heavens one up? Happens every time I think of this machine)
Hydra
The two machines above are basically knock offs of this machine. These are a built to order machine and you can get it customized anyway you like while being manufactured in Seattle.
While attending the SCAA this year as I mentioned above the Strada was on the purchase list. I was ready to hand over the Black Card and have one delivered. Well while in Seattle almost every espresso bar that was not a Starbucks had a Synesso including Storyville, Moto Coffee, and Seattle Coffee Works. This peaked my interest. While on the floor at SCAA I had to see these machines. I walked up looking like the bum as normal and started asking questions to a guy at the booth. He was super nice and knew all about the machines. Come to find out the guy was Mark Barnett and is the designer of the Synesso Machines. Super knowledgable, super nice and gave me more time than anyone at the show while the Synesso booth was packed. Now for those that know espresso machines Mark is the man, really he is the man before Synesso formed he was the designer and USA guy for La Marzooco. Yes the same one that makes the Strada in fact the Strada is a knock off of the Mark's Synesso design.
So I bought a two group Hydra from Synesso, it was made to order, arrived on time and I have never had a problem with the machine. Any time I have had a silly question someone was there to answer no matter the time of day. I can not tell you how awesome this machine is and the service is the best of anything I have ever owned. I invite anyone in South Florida to come on over for an espresso for a Synesso Hydra.
here are some videos of my synesso:
Pulling shot on the new Center Stage Coffee Synesso Hydra espresso machine. - YouTube
Espresso Tonic - YouTube