Need advise - Aramco Jazan Refinery

Coming from the U.S. the salary is usually about the same as you make there, depending on the position applied for. Your wife's salary will not be considered as your salary.
The extra income comes with the benefits, tax break and annual raises.

Search for greencard on the forum, there's quite a bit written about it.
Another way to search the forum is on Google you can limit your google search to specfically this site. For example, if you'd like to reasearch "greencard", type "site:forum.aramcoexpats.com greencard" into your google search engine. This will produce a list of all the forum entries where "greencard" was used.

You would come on Bachelor status which does give you more time off for going to see your family. Most families miss each other, it depends on what your family is used to and whether or not all are comfortable being apart.