A few that come to mind for me:
Yes-Drama
Rush-Permanent waves and moving pictures
ABWH-same (featuring four Yes members)
ELP-Emerson, Lake and Powell
Anglagard-hybris (maybe at the time it went under most people's radar but in retrospect it is considered a very important album in the so called prog resurgence.)
Dream Theater-images and words
Marillion-Misplaced childhood(as well as their first two)
GTR-same (in the sense that people discovered the two Steve's and their two bands because of it)
Asia-same (ditto above)
Ozric Tentacles-Jurassic Shift (didn't do much in the US but I think I read that it was in the top ten in the UK when it came out in 93). Never underestimate the power of the Ozrics.
Mars Volta-Deloused in the comatorium (maybe it came out kind of late to save prog but I bet a lot of younger folks discovered prog because of these guys and this album in particular since it was their first. I remember seeing a young guy at a Yes concert in 2004 wearing a Mars Volta t shirt and thinking cool this young guy has made the connection).
Queensryche-Operation Mindcrime (not really sure about the influence of this album but I suppose it was pretty influential as far as prog metal is concerned. Also, it was a concept album which must have been rare in 1988 especially for a metal band).
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