It's a pity that none of the big things my dad has are in great condition (I guess that means they were well-used which is good), since he has:
two Millenium Falcons (aged and missing some of the smaller pieces),
the Death Star playset (mostly broken now),
a Sandcrawler (still in pretty good condition),
an AT-AT (also in mostly good condition though the door doesn't stay on properly anymore),
the Ewok Village
the Darth Vader helmet carry-case,
Jabba's palace (I believe it was in very good condition up until a couple years ago),
a few X-Wings (all broken),
a few TIE fighters/interceptors/Vader's TIEs (also mostly broken),
some cloud cars (one of which is in fairly good shape, the others have broken cockpits),
an AT-ST (which I think also broke in the last few years),
Slave I (sadly, this one isn't in good shape either),
the "Expanded Universe" toys (most, if not all, are in good shape),
a few other ships like the Snowspeeder and Luke's Landspeeder (most of which are broken).
He also has the Wampa, a Tauntaun, two Dewbacks, two Jabbas, the band in Jabba's palace, and a whole bunch of action figures which are in better shape than the ships.