Welcome to the boards!
It is kind of funny seeing what issues give collectors a hard time compared with others, especially on non big-ticket/widely followed books. I have been focusing mainly on SSWS/US, Weird War and G.I. Combat, throwing in an occasional OAAW/Rock or misc. DC war book every now and then.
That being said, I only have 10 OAAW issues and, by chance, I have a NM 286 I got off ebay earlier this year from bobcat.
Of WWT 60-80, I have all but two in VF or above with more than half being NM- or better - with a lot of help from Blazing Bob and Doug Sulipa if I remember correctly.
And sure enough, I am missing about half of those Dollar GI Combats you mention, the #207 included.
Do you collect the Brave & the Bolds with war crossovers? I have been looking for a B&B 124 in strict NM for like a year to no avail. Killing me.
Also, I'd love to see some of your OA. There is a new OA section to the boards if you ever feel like posting any. Stick around and throw up some scans of your favorite books!