Ok, that makes sense, I know exactly what you mean. The $50 plan is fine its drawback is only the first 500mb's of data are at full speed, after that its unlimited but at about 200kbs or 2G speeds. that is for one month of course every month that data is reset.
If you dont talk much they have a $30 100 min plan with unlimited text and web, the first 5gbs at full speeds after 5gbs its throttled to 2G speeds. Thats what im on, if 100 mins is not enough there are VOIP Solutions that people have tried. or just keep money in the account and pay 10 cents per min after the 100 mins. If you can keep it under 300 total mins per month it will cost about $50
Metropcs plans now have the capped LTE speeds as well except for the more expensive ones. And metropcs is a cdma(for now) phone like virgin mobile, so the nexus 4 will not work with them, though if the merger with t mobile goes through it should when they get things sorted.