BTS will probably crash with BTC, at least in $ value. Hopefully the price in BTC will increase during the crash, but I wouldn't bet on that. I would say that a good entry price for BTS would be 4-5 cents. It might go back to a cent, who knows. It might also never go back down. As always, the rational thing to do when you have such uncertainty and no objective way to tell what is cheap is to use "dollar cost averaging": choose how much you want to buy, buy 10% of that amount every week or every month at whatever price. But this requires high self control, at least more than what most of people in crazy cryptoworld can muster.