I only needed the last few issues of the War Machine series for Avengers: The Crossing. Naturally, the best deal I found was a lot with a near complete run. I just had to grab the last couple of issues and some crossover issues and I had another bound volume.
War Machine Ashcan Edition (optional)
War Machine #1-8
Iron Man #310
Force Works #6 (Hands of the Mandarin part 1)
War Machine #9 (Hands of the Mandarin part 2)
Iron Man #311 (Hands of the Mandarin part 3)
Force Works #7 (Hands of the Mandarin part 4)
War Machine #10 (Hands of the Mandarin part 5)
Iron Man #312 (Hands of the Mandarin part 6)
War Machine #11-14
War Machine: Brothers in Arms #1 (flipbook with Force Works #12)
War Machine: Brothers in Arms #2 (flipbook with War Machine #15)
War Machine: Brothers in Arms #3 (flipbook with Iron Man #317)
War Machine #15-19
continued in Avengers: The Crossing (featuring War Machine #20-25)
-Marvel Comics Presents #152-155 feature a War Machine story by the writers of the War Machine series, and would go prior to the Ashcan Edition.
-The War Machine Ashcan Edition features an 8 page black and white story that is an expansion of the dream sequence that opens War Machine #1. Completely optional, but it is smaller than comic size. A full sized version is available in the War Machine Classic TPB.
-There are multiple editions of War Machine #8 and Iron Man #310, as some came polybagged with a promo insert for the Marvel Action Hour. The insert isn’t needed for War Machine, so it doesn’t matter which edition you end up with.
-Marvel Comics Presents #169-172 contain stories that tie into Hands of the Mandarin. I skipped them because they seemed to be more focused on Force Works or Iron Man.
-The last story page of Brothers in Arms #1 shares a page with the last story page of Force Works #12. The back of the last pages of Brothers in Arms #2-3 will have upside down letter pages. The main stories from Force Works #12 and Iron Man #317 are not needed.