Probably a similar set of answers as with previous times this question gets posted...
http://www.flyertalk.com/forum/trave...ess-class.html
http://www.flyertalk.com/forum/trave...er-flyers.html
http://www.flyertalk.com/forum/trave...what-jobs.html
http://www.flyertalk.com/forum/trave...re-travel.html
http://www.flyertalk.com/forum/19938343-post3.html
The last post link above has even more links within it.
My take is always, do a job you like, are good at, and that will earn you a comfortable living with good vacation/leave policies. For that matter, a job requiring lots of travel doesn't always mean the company travel policies are very employee friendly. Be careful what you wish for.