good guy sprint?

So i just read about sprint and best buy's new student deal- unlimited calling, unlimited texting, and 1gb of data ( or $10 a month for unlimited). I have an unlocked iphone 5 that im basically using as an ipod touch now. I was thinking of selling it on craigslist for $400-450 and add $100 to buy an iphone 5c from best buy and use the sprint student deal. Couple questions, how fast are the data speeds (im in dallas)? Since there is only one model iphone, after im done using sprint can I use the 5c on other carriers, or is there a way to do it? Do you guys think its a good deal? and btw I'm a junior in hs so I am eligible.