Against any competent player, you're screwed no matter what you do. Honestly, your best bet is to keep things tied up. I wouldn't pocket the other ball since he would then have BIH and the luxury of worrying only about what's infront of him. I would shoot at that 9-ball, though. Drive it to the other side of the table to complicate matters a bit. That way, if you do give him an open table, he may have to travel a bit to get out.
Really, you're hoping for a mistake (or a few, to be precise). Imagine what check-mate would be and you'll soon realize what you'll need to have happen in order to get there. Eventually, you'll want to try to safe him behind that 8-ball, right? Make sure when you drive the 9-ball to the other side of the table, that the hook behind the 8-ball is live.