I want to buy a new black iphone 4, but I already have the white one?

So I just discovered that the 8gb black iPhone 4 is free with 2 year contract, (I know that there are additional charges, but that's not what the question is about) my white iPhone 4s hasn't been fully paid yet, but I really want the black one… It was my very first iPhone but someone stole it when I left it in my locker, so I had to save up again and when I went to best buy to buy a new iPhone, the 8gb black iPhone 4s was out of stock, so I had no choice but to get the white one, and I really hate it. So my question is, if I get the black iPhone 4, will they suspend this white one that I have and just add $10 to my monthly bill? (cuz that's what they did when my black one got stolen) What do you think they will do to make it possible for me to replace my white iPhone with the black one?

I can upgrade to the iPhone 5 for free if I want to, but the exterior design just doesn't appeal to me, it's long and the two-toned back just made it look worse, and there's not much interior changes.

I feel that you should get whateve rmakes you happy! Being happy is the best.

Everyone likes diff things! If you love the black one, get the one in black.