A TSR3 19* hybrid. It's very reliable and consistent every time.

I actually picked up a used 915D3 driver in the offseason as my backup. I'd owned one a number of years ago and traded it in when I was in the habit of getting a new driver every year. Things have changed and I don't do that any longer. Usual gamer broke mid-season and I put this in the bag and it was great - very accurate. I'm actually going to be looking on Titleist Preferred for a used TSR2 or TSR3 this offseason.