$38,000 gross. Your take home pay is dependent on your tax situation--married, single, etc. along with you choice of benefits.

Base? Probably Chicago or the yet-to-be-announced southeastern US domicile. Denver will be tough to hold once the new domicile is announced and the relative size of the Denver domicile continues to shrink.

All this is my best guess and based on what I believe to be the typical experience of a new hire FO. I'm certain someone will come along within moments to claim that it's possible to make $50k in your first year. YMMV.