For $400 more you get to have the cordless version of the NE 2000. Keep the $400 and the problems that you will have with the alternator in this machine.
The Nautilus NE 3000 is a solid but unexceptional machine. If you plan to use this machine much you may have problems with the welds on the linkage arm. Exceptional warranty from a solid company. For home use, we would buy the NE 2000, or better yet, buy a Spirit for less money.