Iphone 5s case, storage and icloud?

I need a iphone 5s case. I want something slim, but as protective as a slim case can get. I want something that looks nice too. And… I have a price ranger. I want it to be cheap. Like $15 tops. Ik there's like no case out there for what i'm asking for. But anything similar?
please help.
and also, i have a few question. I kinda know what icloud is but not really. What i know is that whatever you put on icloud, it is backed up. But everybody like if you have to much music, just put it on icloud. But i though it only backed things up, i didn't know it was extra storage?
and say you have 1500 song on your itunes on your pc. When you sync you ihpone to the pc with 1500 song, can you pick and choose what song you want on the phone. So say for this month i only want 200 song, but the other month i want 500. Can i pick and choose what to put onto my phone. So instead of having all 1500 song that i won't listen to taking up space, can i only put 100 on and not take up as much space?

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ICloud is basically storage and backup. It lets you store items there so you can share them with your other devices or family member's devices. BUT Apple only gives you 5gb FREE. If you need more than that you have to pay Apple a yearly fee. So iCloud for you isn't meant to backup everything, it's only meant to make a copy and store stuff you designate. ITunes and your PC will still hold everything else.
Yes. Pick and choose what songs you want. Make different play lists, change them every day or week if you want. See this. 500 is fine. I keep around 650 on mine. Best luck.

You could save some data in iclould.
but here is also a volume limitation of iCloud.
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