The only Floyd record I listen to with any regularity at all is Piper At The Gates Of Dawn (the UK version of course!). It's easily in my top five of British psychedelia. It fricking rules.
Post Syd I like Meddle quite a bit. As the 70's progress it gets a bit dull. Dark Side is alright, a bit overrated for sure. The Wall, IMO, is a complete bore.
I also love the solo Syd records.
I guess I'm not really a Pink Floyd freak, but a big Syd Barrett fan!