I heard that the performance is that of a titan at half the price. and I know people are going to tell me that they use more power but i don't care about power. So is it worth it?
No, a single card like a Gtx 780 or R9 290 would be cheaper and just as fast.
if you have one adding another is certainly an option, but if you're going to buy both i really don't think the problems are worth any cost savings
If you already have a 760 and your system is set up so it can take another then by all means add another. Otherwise you can usually find a r9 290 for just under 400 and that will give more consistent results then 2 760s.