I'd say get Animals and The Wall and just stop.
This.
It's important to note that that recommendation was for someone who already has
The Dark Side of the Moon
Wish You Were Here
A Momentary Lapse of Reason
The Delicate Sound of Thunder
The Division Bell
Pulse
I mean, I like
Meddle, apparently more than most people (I like the whole album, not just the first and last tracks), and there are a few gems on other albums, but really, Pink Floyd didn't make that many, and Bosk already has most of the good ones.