I wouldn't suggest starting mining BTC, the difficulty just rose to about 79.1G which is pretty damn high.
If you have $2000 dollars to spare, buy an S7 and it will ROI in about 3-6 months on average as of now. I don't suggest purchasing any miner under the S5. The S5 is the best $/Gh but the S7 is the most power efficient and fast.
I'd suggest start looking through altcoins. several GPUs (about $250 is what I paid) made more in Ether than my S3 as long as I've had them running. It's your choice what you mine though, Rubycoin, LGBTQoin, Monero or whatever tickles your pickle.
In the end it's your choice.
If you have $2000 dollars to spare, buy an S7 and it will ROI in about 3-6 months on average as of now. I don't suggest purchasing any miner under the S5. The S5 is the best $/Gh but the S7 is the most power efficient and fast.
I'd suggest start looking through altcoins. several GPUs (about $250 is what I paid) made more in Ether than my S3 as long as I've had them running. It's your choice what you mine though, Rubycoin, LGBTQoin, Monero or whatever tickles your pickle.
In the end it's your choice.