I was shooting for 425 - or even, frankly, 405 would be fine.
I am the type of person who hits 370-385 for two deep reps, the result of not training legs as hard as I should. For 170, I'm fine with that though - but I would like to hit 405. I think that's a very respectful lift for 170. Basically 315/405/495, I would say are all respectable lifts for 170.