Im considering putting a little 0.1 BTC on there before the price goes up again. This high DRK price with low XMR price situation is ridiculous and it's only a matter of time before we break from it. XMR is pretty much destined to take DRK's place.
Actually Monero is already as high as DRK.
The supply will be about 14,400,000 in four years, because this is when the fast release burns out and the 4 million coins after that will take a while.
So to invest you should plan for this four year scenario at least.
So Monero is currently worth about 50,000 bitcoin.
I believe Monero is worth easily 10 times that, however that is a big chance.
Please do not make the mistake thinking Monero is cheap, I really don't think it is. It's already number 5 on the marketcap charts.
I'm not sure how many DRK will be mined, I don't think it's a lot though.
TL:DR; Monero is current worth 50,000 bitcoin, don't invest thinking you're getting cheap coins.