Truth or Consequences, NM: Sierra Vista Hospital EMS, a hospital-based service with ALS. Protocols are NM-progressive, trucks are newish, pay isn't...horrific for the area (12/hour, about what you'll get from mom/pop places anywhere), benefits are surprisingly OK (hospital benefits). T or C itself is a town of about 12,000 people built around a large artificial lake (New Mexico's party lake, Elephant Butte), and with the I-25 and the county, you're looking at about 18,000 people all-told. Cost of living is pretty low, super-rural/frontier, and you are the medical (some volunteers, but nothing else really crazy, and no CA-type fire paramedics). There's also Silver City EMS, which is another county-based service in Western NM's Gila Mountains that pays pretty well and is a hospital-based system with a huge area.
If you're looking for small-town, northern and eastern Arizona and pretty much all of New Mexico are pretty nice (albeit lower-paying). Texas is a fairly mixed bag with a lot of small towns. Nevada doesn't have much aside from REMSA/Vegas/Winnemucca/Humboldt County/Fallon (Robb knows more about that). Oklahoma has some smaller agencies, but pay is iffy. (Sinor EMS in Weatherford comes to mind).
If you're interested in California, Liberty Ambulance in Ridgecrest/Lake Isabella/Kernville is *currently* family-owned but is probably going to get sold to Hall eventually.
New Mexico isn't that bad- no RSI but fairly open otherwise. Intermediates can do a lot there...