My apologies if this has been covered before.... I have just recently taken a job in Doha, Qatar and I am a Delta Silver Medallion. Looking at the flight schedules, Star Alliance is the best for me to fly back to my new home in Phoenix, AZ. My question is, do I join Qatar Airways program or do I join US Airways or United/Continental for my Frequent Flier miles to accrue status?

I'm not that familiar with Star Alliance as I grew up in the Dakotas where Northwest/Delta was about all we had, so any help is greatly appreciated. I try to avoid ORD at nearly any cost, but I don't mind making a connection at IAD.

Thanks for your help in advance!