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RE: Cheap and effective way to store your wallet data (BTC, ETH, LTC etc)
Why keep a local copy of the blockchain if you're not mining? There's no good reason to, just like there's no good reason to avoid using alternative wallets. If you can't be bothered to spend a few minutes researching alternative wallets, just run it offline on a bootable OS like Tails. You don't need to "spend countless hours" researching and verifying whether running MEW or some other offline client is secure.
I understand what you're saying, I actually used Electrum for bitcoin and Parity for Ethereum for a while. These light clients work, but the parity multisig wallet incident scared me, I can't risk my funds with wallets that claim to be secure but occasionally fail with zero liability of their clients. I went back to the official wallets, heavy weight, less functional, but always well tested and they require full node sync.
Again, requiring a full node sync doesn't add any value. It's completely pointless and wastes drive space. Just because something is less functional doesn't mean it doesn't have security vulnerabilities, and if security is your actual concern you should simply run whatever client you want offline. For most people, that's going to be MEW since it's very easy to use and set up offline. It's also going to be orders of magnitude more secure than using any wallet synced to the blockchain since that means it's an online wallet.