Two part answer. First, I don't know the answer to that off the top of my head. Second, though, is that I don't think it matters. You need to find something you like to do and then get someone to pay you to do it. If you don't do that, the money won't matter, because you'll be miserable.

That depends on the city. Guage demand by checking out monster.com, indeed.com and other job sites (craigslist?) for the city or cities you're interested in. Job postings tell you the skill sets too (no two of them alike!).