Your Verizon plan has unlimited data, but you mention wanting "increased data at lower cost." Well, it's hard to get more than
unlimited data
so I guess what you are really wanting is lower cost.
Best thing would be to sit down and make a list of what you really think you'll need. How many minutes, how many texts, how much data. Then make a list of the various services you are discovering, and what they provide at what cost. If you can put together a package of services that will save you money, great. If not, then you already have the best deal for your own needs.
I did this for myself a couple of months ago. I am a low user, though. I only use up to 30 minutes/month, a couple dozen texts, and next to zero data... but I want to be able to use more data during the summer months while traveling, and I'm not yet sure how much will be enough. So for me, the flexibility of Consumer Cellular won out over the others (about ten companies) I found and compared.
If you need a thousand minutes a month and a whole lotta data besides, I am not sure if you'll find a better package... unless you can be happy with MagicJack or PDA net or some other method of routing most of your minutes through wifi to make them part of your data.