I am in the process of building an HPR06. This is one of the boats that is on the site that you posted. It is one of the nicest hulls I have ever seen. I would recommend it.
2 Motors; Neu 1521 1Y
2 Escs; Kontronik Power Jazz
Batteries; TP Extreme 10s2p 5000mah
I am shooting for 70+mph but not to start. I would like to start it around 50mph and work my way to 70+. But this is all high end electronics. They cost big $$$$ if you want a boat that is fast and reliable. I have already pushed the $3000 mark on this one. You could run cheaper electronics but you get what you pay for.
Here's a link to my build [link=http://www.rumrunnerracing.com/feforums/showthread.php?t=22822]click here[/link].

But I wouldn't recommend someone "new to RC" jumping into a 50+MPH boat. I would recommend you working your way up to that goal. Things happen really fast a 50+MPH. One little mistake could cost you your boat, OR SERIOSLY INJURE SOMEONE.
I would recommend you building a boat that is upgradeable. For example start out with a lower cell count and add cells to work your way up to the speed you want. Take my setup for example I am not going to start with a 10s2p pack. I am going to start with a 6s2p pack and work my way up to the 10s2p pack. Even though I already have all the cells to make the lager pack. I don't feel comfortable starting out with this boat going that fast.