Thanks a lot for your answers everyone. I think i'm going to stay away from blockchain.
Concerning the wallets, i'm really interested into Electrum but... the problem is... i'm extra paranoid about my hardware. I really don't want to face hdd failure. I heard i can back up the wallet so i think i should get some reliable usb keys for that. And of course i know about the wallet recovery systems but i really wanna avoid such "issues". I'm going to give it a try anyway.
EDIT: Electrum installed and wallet created
When creating your Electrum wallet, you will be asked to backup your 12 words seed. This is all you need to recover your wallet if anything happens to your device.
Write down this seed and keep it in a safe place (and preferably in multiple places) where no one can find and steal your coins. By doing that, even if you face a HDD failure, you can easily recover your coins. You can also encrypt your wallet with a password and keep the file in multiple flash drives.