RE: Would you hunt this 170"-class buck with a bow?
Ditto what DoubleCreek said. Dump the groundblind idea. And yes, your best bet will be those first few days of the season.
I think you should have a decent chance at him since you have been watching him so much. You should have a good idea exactly where he is coming onto the property at. Play the wind right and give it all you got. Good luck!
ps: I hope your area isn't like where I hunt, or that deer won't have a chance if he keeps showing himself. In fact, he'd probably already have been shot by the roadhunters around here.