Quick Question

Hello, I'm fairly new to the community this is actually my first post.

So here is my story. I got my white 3g 16gb back in January. Its been just great. I just got a brand new (refurb) yesterday from Apple due to cracking, dust, overheating etc..

Today I was offered by a friend to trade for his less than 30 day old 3GS 16gb Black for 100 dollars on top. He just got the phone as says he barely uses the internet and has no use for the new features. Now I believe this is a great opportunity for me to get the 3gs as well as a new warranty and phone but what is stopping me is the color. I'm not particularly fond of black and I dont like to use a case. I believe its possible to bring it back to AT&T to change colors (plus getting a brand new one) can anyone verify this.

What would you do?