One thing to keep in mind, MM. If you don't already own a Busse Combat INFI knife, you're going to have to get one sooner or later. Otherwise you'll never know what it's like to own "the best of the best". The NMSFNO would be a GREAT INFI knife to own and it's reasonably priced by INFI standards. So if it catches your fancy and you don't already own INFI, I say GO FOR IT! <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />
I don't own an INFI knife, but I am still keeping my fingers crossed for a sub-$200 S5 in INFI. My main worry is that I would get my NMSFNO and immediately abuse it like I did my Mini Uncle Mojo, and then be unlikely to get most of my money back out of it on the exchange, since there are a pretty good number of NMSFNO's out there already.
As you said, I am definitely leaning towards the res-C handle for choppers, so I wonder if it's worth the expense just to say I own an INFI chopper, especially given the chance that I might be able to snag an infi knife WITH res-c in the next couple of months.