Is there a wallet we can use to store Bitcoin and all other assets such as LTC, ETH, DASH, DCR?
Click on my signature one of the best wallets available in the market. Plus it supports all the currencies. It's quick and easy to load and understand. You can very easily operate it and I already started using it. Plus bonus they give is a 50% affiliate bonus. So I feel all your needs are satisfied with Bit.ac wallet. They are here in bitcointalk.org so you can even reach to them in case of any help required. Hopefully this is the answer you are looking for.
Your suggested wallet is the same as the wallet I am using. I prefer on using application wallet called coin.ph where you can used it with your mobile devices and smart phones. It is handy and also easy to understand and to used. You can buy load, pay bills and even convert bitcoin at the same time hold alk your bitcoin so it is a multi-purpose wallet. And if you do trading coin.ph is the bedt wallet for you because you can monitor the price of bitcoin and the developmet of price for you to decide wether to trade or not. It easy, fast and reliable wallet for all.