I was originally going to consider the 4gb one also. But ever since I heard about the new tiered data from Verizon I've been watching my data closely and found out that I don't ever exceed more than the 2gb/month plan. My daily commute is only 25 minutes and I don't always listen to pandora, spotify, etc. every single day. Generally just a couple times a week if that.
I'm curious to how much will be used with LTE. so I think for 3 months I may try out the 4gb...still not sure if I will even upgrade.