About that Nexus 5...

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 buy a nexus 5 from best buy and use the sprint student deal. Couple questions, how fast are the data speeds (im in dallas)? after im done using sprint can I use the nexus 5 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. ALSO POSTED IN APPLE CORE FOR IPHONE 5C