Do you need a pc jack to use a pocket wizard?

The Nikon sb700 has no standard PC jack, so can I not use pocket wizards unless I buy that hot shoe pc adapter thing?

You are correct.

Or you can use Yongnuo RF-603s, which are really just as good as the Pocket Wizards, and they have a built-in hot shoe so you can just attach the SB700 directly to it.

Yes, you are correct. The way to go nowadays is wireless.