The second X album is great, as long as you don't go into it expecting the same sound as the first album. I mean, "TV Glue" sends chills down my spine just hearing the first two notes..."All Over Now," "1/2 Way Around the World" ahh, there are lots of good songs on it. And for those who are curious, Morphius reissued At Home With You a few years ago. It shouldn't be hard to find.
The third X LP is good, but it was recorded in the late '80s...expect a further mellowing (though not intensity) of the sound. It's not that hard of a record to find, and not very expensive either.
As for Radio Birdman, I think part of the problem is that they got/get lumped too often with "punk," when they never claimed to be a punk band, never associated a whole lot with that scene. They were as influenced by the Stooges as they were Blue Oyster Cult (which is a good thing, in my book). When I first heard Radios Appear, I was seriously let down. It sounded more like the Doors than anything related to punk. But a few years later it grew on me and now I can put it on anytime and really love listening to it.