Chris - I looked at the Hellrazors too when I picked the Montec.
Essentially, they're the same head. The only difference that I noticed was that the Montec appeared to be molded out of one solid piece of metal, while the Hellrazor is one-piece, butwelded together. You can't see it so well on these pictures, but the weld lines are readilyvisible on the NAP website.
http://www.newarchery.com/

Hellrazor (above)
Montec (below)
Conventional thinking would be that they would both fly really well, and penetrate superbly. Narrow ferrule, shorter profile, COI.
I don't think you could go wrong with either one, really. The price was a wash, so I just picked the Montecs because I couldn't see any weld lines - and I knew some guys who had good luck with them. Dumb reasons? Probably.
Also, G5 was giving those Strikers away last week, so that drummed up a little bit of good will with me, from a consumer's perspective. I figure, if they have so much faith in their products that they're giving them away for people to try - they must be good.