I started The Culture series a while ago. I read both "The Player of Games" (amazing book), and "Use of Weapons". Also amazing, with a Memento-like storytelling that was also incredible. I did enjoy both books a lot for different reasons, I can't vouch for any over the other really.
I then moved to "Consider Phlebas" and honestly, got bored to death. So my recommendation is to go for these two as well.
I recently (This month, bought a recent "deluxe edition" of sorts [1]) re read Neuromancer, and then jumped to "Count Zero" but at some point got bored mid way with Gibson's endless descriptions of non things.