You want to use the biggest jig necessary to stay straight up and down. So how ever large you need to do that is the one you want. I personally jig with the 150 gr and the 200 gr jigs. I have seen it when I couldn't get down with twice that, so current is what you have to deal with. I went out to 405 foot of water just after Christmas and was able to stay vertical with 5 oz and 7 oz. Which is the 150 gr and the 200 gr.
100 grams per 100 ft is a good starting point. But wind and current can affect that. They are not usually too bad out of Va, but the firther south you go the worse it can get. The braid you are using can make a huge difference also, based on diameter.
I always want to go as light as possible, however the jig need to also be heavy enough to load your rod properly.
My current rods are 300g rods, so regardless of depth, I will be jigging 240 -300g(or more) jigs this weekend. However at the rod show my main goal is to get a custom 200g rod for lighter inshore stuff.