I wouldn't want it anything more than %30 in BTC since it's still not practical to use BTC physically and it's not accepted "at least not regularly" in real shops therefore I would need to exchange the rest to USD, There might be time in the future where you can use BTC physically + get paid in BTC 
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the same for me, i think that it is better to not get too much in bitcoins because it would be possible to lose money .