Hawkwind "Spirit of the Age Anthology" - Covers 1976 - 84 on three CDs. If you're pirating everything you don't need box sets like this, but if you want Hawkwind from this era on CDs it's going to be expensive, as these albums always seem to cost alot and are not easy to find used. When I got around to listening to the albums in their entirety I found that the tracks left of the more fully represented (and better) albums were usually pretty disposable anyway. It's nice that the collection starts in '76 instead of at the very beginning, as the albums before that are more classic and (aside from Hall of the Mountain Grill) were cheaper and easier to find back when this collection came out.
There's another collection called The Dream Goes On covering the later period but the material they had to choose from isn't as good so I'm not as big a fan of that one.