Should I sell my iPhone4 and get the new iphone5s?

My iPhone 4 works perfectly but I have an upgrade available. I was thinking about buying the new iPhone 5s for $150 and selling my iPhone 4 to pay for it? Good idea? Or should I just use the phone I have since there's nothing wrong with it

Sell your iPhone 4 with NextWorth and get enough money to help you upgrade to the iPhone 5S. Check it out: http://www.nextworth.com/search/1/cat/iphones/sub/iphone_4/

Maybe walk into a store and ask to see the iphone 5, get a feel for it to see if its worth it.
if in doubt, don't.
these places might help you to sell your phone too: http://phonetroops.com/sell-your-smartphone/

Yea, why not upgrade. Yes the 4 may work fine, but there's nothing wrong with taking advantage of an opportunity.