I have both the "Malcolm X Memorial" and "Spanish Suite", and they're both great! A little low-fi in the recording-quality department, but nothing that bothers me (think Sun Ra recording techniques). "Spanish Suite" is a little long in the tooth (about 45 minutes of material in one long suite, that could have easily been 25-30 minutes), but it's still a lot of fun.
I had a chance to get "Armageddon" but was able to sample it first at a listening station, and ended up not biting on that one. (Short disc, and half the tracks didn't do it for me.)
I've never heard "On The Beach" nor the more recent "African Skies" - but I am definitely curious about both.
If you're searching on Dusty (or elsewhere, I presume), be sure to search on both "Phil Cohran" and "Philip Cohran" -- there are titles listed each way (or just search on "Cohran" only).