Well, it depends on you, which dialect you find  easier and depends on the job. Egyptian dialect is useful and can be understood by most of the Arab. Also, Khaliji is used by so many countries with a bit of difference. 

It depends on where you want to work. learn the dialect of the country where you want to work in. If you want to work in your country, it is better to learn modern standard Arabic.

Dev, normally people advice Egyptian and Levantine (in this order) because they are widely understood (their media and TV production are widely known) I'm learning Moroccan because... Becuase I jsut want it so:)

But you're speaking of jobs! Jobs is not the same as popularity of a lnaguage, it is not that you don't have a job with a rare language (like Burmese). Less popular languages mean lesser choice but also less competition:) Companies and institution dealing with a country need people who know local languages. Less companies and less people too for less popular countries... Sometimes it is good to be unique. Sometimes. Not always. Here such jobs often imply moving to the country (or sometimes you find a job in academy).
More popular languages mean wider choice and less adventurous opportunities.

I think, it is American Arabic students who know about jobs for American Arabic intereterpreters/translators. I think it is Americans working in the field who can give qualified answer about jobs. Your country must has contacts with many Arab countries, from Gulf countries and Jordan to Morocco. None of these places is 'exotic' in the sense above.

If I were you, I'd just go for the dialect of the country I like. But that's me! And I would aim at knowing more than one dialect.