I couldn't resist putting in my two cents here. re: your decision between the Buck Strider and the P-Sark. I've carried the Buck Strider on Vollie duty myself, and that thing does get to be a bit of a chunk to have in your pocket, and the rough G-10 on the handles is hell on uniform pockets (of course so are frequent wave openings)
I actually have a personal motto that says "if enough is enough and more is better than WAY TOO MUCH MUST BE JUST ABOUT RIGHT!" It seems I met my match carrying the Strider. it was way too much for routine duty, although it might be useful if I was on a mountain/wilderness rescue team, but I doubt it even then for me. (my perspective is unique when it comes to knives in the woods though)
Especially if you're working around patients the P-SARK is much more nimble to handle, probably less scary, WAY fast and cool opening, and plus you'd have the added benefit of aquiring a standard SARK as well if you find yourself cutting near patients very often. (not sure if you're an EMT as well, or sticking with FF) That way you can have an extrication knife or a defensive knife with the exact same feel (just don't get them mixed up!

) It also isn't so blocky, heavy and awkward once you add a Sam Brown and or the other equipment.
Incidentally, I'm a wierdo that DOES cut seatbelts on a freqent basis at MVA's, even during the most simple extrications. Primarily I do this for the aftermath of the accident with investigations and such. It basically confirms YES, my patient WAS wearing a seatbelt. Seems there's difficulties enough for a patient without dealing with the insurance companies, investigations, etc. But, once again I'm strange this way, I've met very few other EMTs and FFs that do the same thing.
Hmmmm....although if I you had a sheath for the Strider it might not be THAT bad...
when I was looking into buying one a month or so ago, the most standard price seemed to be $125 for the SARK and like $145 or so for the P-SARK.
Happy shopping and I hope you get the one that best suits your needs!