Ethereum.
it was around $700 when i bought it early last year.
was new to cryptocurrency, after all, so i was steadily checking coinmarketcap, I got interested that it was next after bitcoin and i decided to give it a shot.
i got some (buying), also acquired some (mining) and in december, i sold off a large chunk. And it really helped i must say..
And now, its STEEM. the future is so bright