| I was actually talking to my personal trainer about my plateau at 170 lbs a couple of days ago. She said that I should probably add 2 days of legs during the week and condense the rest of my routine. Also I should do squats, deadlifts, bench presses plus a few more complex lifts more often. Lastly I'm not sure what your reps are at but i was doing about 4 reps of 8-10. She said I should drop it to about 6 reps of 6 and just start with higher amounts of weight.
I also agree with phate89, it seems that your routine seems to involve alot of isolation. | 
