Is it worth it to buy an iOS 6 iPhone 5 and sell my iOS 7 iPhone 5?

.Since I can't downgrade

That depends on how much do you care about the iOS. Do you think that the unpleasing of iOS7 is equal to the lost of $100 or more?

Downgrading ios 7 to 6 is almost impossible bcs apple has blocked al downgrades.
ya it will be worth to buy iphone 5 with ios 6.1.3 or below bcs 6.1.3 unthered jailbreak is soon to be realesed. There's no jailbreak for ios 7 wil take time. Ios 6 looks cool with 3d interface but ios 7 just looks like android iphone with many bugs to fix i just sold 1 with ios 7 and bought ios 6 one.