Well, I can't tell you about the rates for Net10 as I haven't paid much attention to them, I'm primarily on Tracfone which is a different rate structure than Net10. I'm sure someone else will pop-in and give you the info on that soon.
As for coverage, according to many other posts I've read Tracfone and Net10 get the full Verizon coverage where Straight Talk only gets the pre-paid coverage which isn't as good. So your coverage on Net10 will be the same or better. As someone else eloquently put it when buying a phone from Net10/Tracfone, you have your phone selection zip, your phone activation zip, and the shipping zip, mix and match as you please. If you get CDMA coverage with Straight Talk now, you can activate a Net10 CDMA phone. So use the 59802 to bring up the phone you want, add it to your cart, but before checking out make sure you change the shipping zip which will default to 59802 to the correct zip. Or, if they sell the CDMA phone anywhere around you just pick one up at the store. I order my Net10 and Tracfones using BigCrumbs.com to get 24% cash back deposited to my Pay-pal account, check it out (http://www.bigcrumbs.com/crumbs/sear...acfone&x=0&y=0).
Are you going to port your number or just get a new one?
Side note: View the Straight Talk CDMA coverage (http://www.straighttalk.com/Coverage) and you can compare it to Net10 coverage (http://www.net10.com/jsplib/verify_mapcov.jsp and use the 59802 zip so it shows the CDMA coverage).