agree with all. JEMS is a waste of your time. Annals is great. also, if you join ACEP as a student and get the EMRA subsciption with it, the EM resident magazine has some great pearls in it every month.Prehospital Emergency Care is a good one, although it comes out fairly infrequently- (I think only 6 times a year?) and it's *really* expensive considering. Annals of Emergency Medicine isn't specifically EMS based but you can still find a lot of relevant stuff in there.
Agreed JEMS is a huge fail. It's really a magazine, not a journal.