Wow, looooooooong time no post!
I own the Starmate, Military, and Native in that steel. The Native is my favorite and is usually my EDC (every day carry, and a perfect combination of utility and tactical IMHO), but I'll discuss the other two since those are the ones you're leaning toward getting.
The Military is really a blade designed for utility purposes first. It has a long belly which makes it an excellent deep cutter and slasher. Its profile is more "angled", whereas the Starmate is a straight handle-blade configuration. So it really depends on what you intend to do with the knife.
The Starmate looks to be more of a tactical fighting folder knife. It is a beautiful knife and obviously more aesthetically pleasing than the Military. Both are quality knives, but the Starmate gives you the feeling of owning a custom, whereas the Military seems more like a workhorse despite its negligible weight (both knives are extremely light for their size, which is due mainly to their thin profile and single small-yet-tough inlayed scale).
Personally, I prefer the Starmate because I like to carry mine mostly for "if-backed-up- against-the-wall-and-cannot-run-then-defend- yourself" type situation. YMMV. It is more aesthetically pleasing to me, and is really my favorite Spyderco folder along with the Native (especially the inlayed and BF Native). However, if I needed to go camping or treking through "El Yunque" (a popular rainforest down here in Puerto Rico), which I unfortunately don't do quite as much as I would want, I would never bring the Starmate, and would instead bring a heavy-duty folder like the Military or the Al Mar SERE 2000.
Hope this helps!
-Flood