Okay, I'll go again. And I'll be controversial.
10 Yes
10 Time and a Word
12 The Yes Album
9 Fragile -
15 Close to the Edge
10 Yessongs +
14 Tales From Topographic Oceans
13 Relayer
10 Going for the One
5 Drama
10 90125
10 The Ladder
11 Open Your Eyes
11 Magnification
0 Tormato
Fragile's got some great songs, but some pretty ropey moments that weaken it as an album IMO. But I'm also pretty surprised the TfTO is flying so high in this thread. And Yes, Time and a Word and all the post main sequence albums are just getting ignored like anything!
I'm bumping Yessongs just for the great performances of a good cross-section of the band's music at that time.
Won't this get a little dull if it's all votes and no comment or discussion? IMO.
My minimalist Yes collection would be
Yessongs (for the best tracks from Yes Album, Fragile, CttE, all performed so well

),
Relayer and probably
GftO. I'd then add the
Yes Album,
CttE and
Fragile (in that order) for the studio versions, then
TfTO just to complete the main sequence. And maybe
90125 for a taste of the newer/Rabin type stuff. Funnily enough, that's just what I own at present.
BTW, I don't think any Yes collection is really complete without their version of America (which isn't on any of the original albums here listed as it appeared on the Yesterdays compilation - although my Fragile CD has it as a bonus).