Great list - these are all worth checking out. Some of these games I spent way too much time playing.
I think Ultima 7 is probably one of the best RPGs of the 90s. Ultima 6 might have been the first to 'clutter your entire world with junk' game, but was both beautiful and massive for its time (though 7 did everything better).
It's hard to go wrong with most of the classic Sierra games, though the text entry ones are in a special difficulty level of their own. King's Quest series. Conquests of Camelot was enjoyable. Colonel's bequest. Space quest series.
The Kyrandia games were enjoyable but I played them not too long ago.