Replying to Fix my iphone 5 or buy iphone 6

I cracked my iphone 5 screen pretty bad and im starting to get used to it but id rather have a new screen. I didnt have a case on it because my old one broke and i dropped it so many times i figured itd never break but sure enough it did. repairing the screen is easy, anyone can do it and ive fixed my friends before. I also have my upgrade through US cellular and i like the iphone 6 im not sure how much itd cost but what do you guys think. Fix my iphone 5 and buy a case could cost 60-70 dollars, or buy the iphone 6 with a discounted price which i do not know.