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