I'm interested in switching from Sprint to a pay-as-you-go vendor that uses either the Sprint, US Cellular, or Verizon networks because those have the best coverage in my area[1]. I don't have a strong preference right now between a smartphone with dataplan and a featurephone with just voice/text, but if I opt for a smartphone it'd have to be with a Sprint or Verizon vendor because USC doesn't have LTE coverage here yet.
Right now my wife and I share a Sprint featurephone plan with unlimited minutes & texting but no data for IIRC around $100/mo. I don't know how much data we'd use per month yet; we've both got tablets and computers to hand. As you might expect from our crap phones, I'm most interested in saving money but I wouldn't object to getting a decent Android device.
Sprint themselves have a PAYGO plan but their phone selection is crap with most of the available units out of stock and the rest being feature phones.
[1] Also they're not AT&T, which I hate.