Introducing CoolWallet, a hardware cold storage device. It can sign transaction offline and broadcast to the Bitcoin network via our app (free and open source). It can also be used just as a cold storage as it is completely isolated from the internet. Here is the link for you to see the most convenient cold storage. http://coolbitx.com/coolwallet/index.html
How to make a transaction using CoolWallet?
1.Scan a QR code or paste an address using CoolWallet app
We are also working on a exchange site that will not keep users bitcoins but only fiat. The trade system is like Bitstamp where buyers/sellers post orders and deals are made when prices match. How does this sound?
The exchange site will go live in about a month. We will keep you updated.