Agree with all the above posts, the Armstrongs are a complete nightmare to trace.
Same as you guys, I am tracing Armstrongs from Bewcastle and Cummertrees & Annan. Same names cropping up...Little, Scott, Henderson and Wilson
I spent a few years tracing German and Irish ancestors, but the Armstrongs are a nightmare.
I also agree that Scotlands People is far to expensive and informed them so when they emailed a survey to me  

Below is my present status.... 
William Dixon marries Margaret 
Mitchell  b.Bewcastle in Bewcastle 9-3-1872
David 
Mitchell b: Bewcastle (Margarets father) marries 
Mary  Armstrong in Bewcastle (no date)
Richard Armstrong (
Mary's father) marries Catherine Wilson in Bewcastle 20-6-1824
James  Armstrong b. Bewcastle (
Richards father) marries Janet Scott 4-4-1789
William  Armstrong b; Cummertrees (
James' father) marries Mary Henderson 
James  Armstrong (
William's father) born in 1688 marries Catherin(e) Carli(s)le, he then marries an Agnes Haughan (born in Annan 10-9-1728)...
I can't believe that age gap, has anyone else come across this before??A James Mitchell married a Margaret Little in Bewcastle 15-3-1819.
I may take Jeffrey's advice and join the Armstrong Clan Association.
Apologies for jumping in on the post
By the way, the following link is a great link for Armstrongs in Bewcastle.. 
http://www.bewcastle.com/inscript.htmJohn