You might have already decided what to do, but I'll send some thoughts anyway...I've had this happen to me before. I can't tell you which to take, but here are some questions you should be asking yourself/things to consider:
- First and foremost, is there one job or company you like better than the others?
- You have one job offer. Until you get a written offer (and better yet, contract signed), nothing is set in stone. If you turn down #1, there is no guarantee you'll get #2, #3, or #4.
- How much do you NEED a job? Can you afford to wait and see what happens with the other 3?
- Do you WANT to move? Do you want to move to the places the 3 companies are wanting to send you?
- You're in demand, and company #4 at least really wants you. For #2, #3, and #4, I would use the offer with #1 to gently push the other 3. Tell them you'd like to work for them, but you have another exploding offer and you'll need to provide them an answer.
- The HR director being on vacation means nothing if the company really wants you...they won't let the person they want get away unless they're completely inept.
- Since you've accepted the offer for #1, there is no way to get out of that without burning bridges unless, possibly, you take #3 and tell #1 you didn't want to move after all. (Do people at these companies know each other?) This isn't to tell you don't burn the bridge, just...it's unavoidable.