It's been too long since I've had to worry about that, so I'd rather not guess what today's prices would be for a catered dinner.
More recent experience has been with lunches at work. For catered deliveries, our wonderful local barbeque charges about $14/pound for the meat, 40 cents each for the rolls (buns), $9/quart for side dishes, not to mention sauce and beverages...it adds up fast! Probably $10 a head for a serve-yourself informal barbeque lunch, without alcohol. I guess what I'm saying is that anything less than restaurant menu prices is doing well.
Another thing is the expectation of the bride's family--what are their customs and expectations, so you can avoid something that might offend them. You'll have to sit down with her and her parents so they can explain, and she can translate for you.
Ham hocks and beans sound pretty good to me, but for a wedding maybe you should go "whole hog" and do the pig roast instead (he said jestingly). For 200 people, you'll need a really big crock pot!