gofastalot,
Yes, you got MAGNUM machined micarta on your NMSFNO. All NMSFNOs came w/ magnum slabs but the site states machined to distinguish them from "hand shaped" (smooth) mags which were an extra cost option. As to the handle shapes, the Skinny ASH is an anniversary reproduction of the Steel Heart 1 which is an old school straight handle blade while the NMSFNO has the Special Forces style handle, the SF in NMSFNO. Jerry does things his own way so that the knife comes only with the handle style offered. We may get the option for mags vs. standard slabs or machined vs. smooth, hand shaped but Jerry's blades are what they are and they fit you or don't.
As to what you should be looking for , if it is the shape, you like the palm swells, go for the mags. If it is the overall handle thickness, you may prefer mags on thin blades and standards on thick ones. The only way to tell is to handle them. Ask if there are any HOGs in your area that are willing to do so, perhaps at a get together. Or, buy one, try it and if you don't like it, sell it on the exchange or trade it for another. BTW, welcome to the forum and INFI insanity. Forget Cocoa Puffs, people go Koo Koo for Busse blades. Have fun and good luck finding your ideal Busse(s).
Pete