I will get round to answering everybody but for now, as regards Electrum, IF I opted for it, to guarantee safety wouldn't t be best (just like with bitaddress) to do it on a computer which never has been used for the internet before and which never will be connected to it again in the future?
Electrum wallet is open source, you can download it, install it and create your wallet offline. If possible, as recommended it, verify it before using.
Use strong password to protect your wallet access.
Use multi signature wallet like 2/3 cosigners if you want more security and also afford to pay more transaction fee.
If you can have an airgap device for your wallet, it is good and it is what you asked.