Prepaid phone experience

I just realized my Sprint contract is ending in 10 days (!) and I've been toying with the idea of prepaid smartphones (i.e. the Nexus 4) for months, so I thought I'd go ahead and take the plunge!

I live in New York City, and I don't travel often, but I walk around a lot for my job so I need reliable coverage so I can hear over the city. I don't use a lot of minutes, but I can use quite a bit of data. My data usage varies from month to month, and I have been known to use the mobile hotspot feature, but I don't really go over 1GB often. Then again, that may be due to the fact that I have had to reign myself in to keep my battery from draining at the speed of sound.

Any experience/advice you can share with me would be very much appreciated. Thanks in advance for your time and assistance!