The 3 options that you have chosen are great, but I would suggest a little different splitting. 45% BTC, 35% ETH, 20% LTC. ETH is getting a lot of attention so its better to invest a little more in it. But I would like to advice you not to invest all your life savings, just don't do that, keep some in bank you never know when you might need them.  
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Might be better you split your capital into minimum 5 different coins.
And dont invest all of your saving. Just invest how much that you can afford to loss.