Best way to get the iphone 5S?

I currently have the samsung galaxy S II i bought back in 2011 from verizon, i'm not eligable to upgrade until march (suppose to be in november).so i have to wait another six months and my phone is really getting on my nerves. I went into verizon today they told me i can add another line and as the upgrade, but i don't want two lines and i just want one. So i was thinking can i cancel my first line after doing so? What are the other options?

I assume that means you pay the cancel fee because your contract isn't up, but ask them.