Fragile for sure #1. Of course it has Roundabout, one song I have had enough of, but the rest of the album is great. This one has Bruford at his best with Yes in my opinion.
Before Close to the Edge, I would give "The Yes Album" a shot. Yours Is No Disgrace and Starship Trooper are classic. This one has I've Seen All Good People as well, which is good, but a bit overplayed. However, this album is sans Wakeman. This is why I prefer the live versions of these songs, as Wakeman brings it when it comes to keys. Tony Kaye is only so-so. Once you know these songs studio style (which are great), when you see those songs performed with Wakeman, they take on a new dimension.
Then give Close to the Edge a shot. Remarkable album, but you need some patience to get through it. The title track is about 20 minutes and is an epic.
EDIT: Even better option, get Yessongs (Live recording). The CD, not the DVD. The DVD quality is bad, very bad.
Then, get the Anderson Bruford Wakeman and Howe DVD I recommended.
This is all assuming that you enjoy #1 enough to try #2, and then #3. Yes is not for everybody. They are indeed in my top 5, and is the band I have seen live the most.
Scottiemon