Thanks for the reply Mark. I will respectfully agree to disagree with you on some matters, but I think you have a good head on your shoulders. We are all looking for truth these days.
I have two Orthodox sources for you, but please realize there is a lot of divergent opinions on the identity of the lost tribes, and individual sources are going to vary. These two sources put a lot of effort into identifying the two tribes, so I guess they have the best amount of information on the subject so far.
One source is Rabbi Feld from the Maccabee Institute in Israel. Link is here: http://www.maccabeeinstitute.org/
Brit-Am is also a good source: http://britam.org
Good luck!
Thank you. I will check them out.