Depends what price you can get the 1070Tis at. The X1's going to be insanely risky if you choose to buy it, and the 1070Ti makes around 80 cents as of today mining, after electrical costs of $.10/kWh. Assuming you get your 1070Tis at ~$500 you aren't going to break even for more than 12 months, and that's if mining profitability doesn't continue to go down. I'd actually suggest not putting more money into mining right now as things are all  high risk and low reward. Buying any CryptoNight ASIC right now is essentially gambling.