Thanks IP, sorry but for right now I'm not giving up data. When I want to go back to my flip phone, it's right here waiting for me but, until then, the smartphone and data stays. I have read the other thread (part of the research I mentioned) and VM is one of the providers you listed.
And you're basically asking for the impossible - a truly "unlimited" data plan (possibly on another iPhone) without any contracts and for less than what Verizon's got you over the barrel for already, and you also want to limit your provider scope to companies that start with the letter "V".
Something has to give, and that something is either your money, a contract, the letter "V", or your "unlimited" data. You've already made it pretty clear you don't want it to be your money or a contract. You can either accept the reality of the American cellular markets, or you can keep at the Sisyphus impression.
Yes, Virgin's on the list, but it's Sprint network coverage only and the throttling can be pretty heinous once it kicks in (not that Sprint's data services on their MVNOs are much to write home about to begin with) and so long as you're angling for that whole "unlimited" high-speed thing (and you
are looking for high-speed service, otherwise you likely wouldn't be able to use so much data) with your usage and are unwilling to scale back, it will do nothing but disappoint and frustrate you past that cap. Keeping that in mind, given you're in a "larger metropolitan area", the cheapest MVNOs to deal with that will give you the most amount of data for the cash before throttling caps kick in are going to be T-Mobile based (specifically GoSmart), which means pentaband GSM handsets... which is why I said what I did.
You wanted advice, you got it. Take it for what it is, or keep whinging about us being mean to you for not satisfactorily swaddling the answers in a sufficient layer of goose down and candy floss.