Totally agree with bluerrpilot, Beat'n will cover the most boards of the three. The NM will start the earliest, and the BWP will be the most angular.
If your lanes are a little on the dry side, he might think about something like a doom or maybe even a blue vibe. Neither of the two NM series balls are for dry lanes by any means. They might even burn up a little early on him, and have nothing left on the back. Just something to think about.
And by the way, tell him not to hesitate to think about one of the vibes because they're "entry level balls." Trust me, judging by the hit and carry of these things, you'd never be able to tell they're lower-end stuff.
Matt
--------------------
http://www.hammerbowling.comhttp://www.hammerstuff.com"Nothing Hits Like A Hammer"