I am, a HUGE fan of Pink Floyd, them being my second favorite band ever, under Led Zeppelin.
I have noticed that you have left a few albums off.
Obscured by Clouds
A Saucerful of Secrets
Soundtrack from the fiml More
Piper at the gates of dawn (Debut)
Were all not listed. IMO, my favorite album is either a tie between Obscured or DSOTM. However, I voted for Meddle, as I have been listening to it a lot lately.
The new sound that was introduced with Obscured really helped the band move into the DSOTM/The Wall sound and helped them progress from the psych-pop they WERE in with Barret and early Gilmour.
Most people who are sort of... new to PF pin their best at DSOTM. If it weren't for Obscured by Clouds, DSOTM wouldn't be what it is. The progressive/soft rock came with Obscured.
DSOTM is a GREAT album, I am not downing it any way, it just got most record sales, mainly because of Money, Us and Them, and Brain Damage.
Meddle also paved the way for DSOTM, with Echoes. Echoes pretty much defined the PF sound for the band. That, mysterious, subtle, yet moving and progressive sound that they have.
That's just my opinion. Lyrically and lengthwise, my favorite album would be Animals.