Well, I think that every gig I've been to was unique (not that the setlists were much different ) But! I have few in mind that have been in my memories til now, mainly: Hannover 2008 -> What I've Done opening with a great intro, Valentine's Day, My December, A Place For My Head \m/ and closing One Step Closer with new outro. Well, you don't have so many "new" things in one concert very often. Next in line is Brno 2008 -> Back then, despite Hannover, this was the best outdoor concert so far (for me). There haven't been any remarkable things going on besides Wake 2.0 and Reading My Eyes (in case of the setlist) but the crowd was really great from what I have seen from the "seats" if i can call it like that. Though, a big number of people wondered what the hell are they playing when LP started RMA . Other than that the crowd sang along in every song. Bleed It Out was great (Ooooooooooooo ) and Faint blew my mind (especially the extended outro part).
Ending with Gräfenhainichen which has been...well...,despite some major problems before and after the concert, the best Linkin Park gig I've been to so far Good setlist + reaaaaaally great venue! + lighting + great people I've met -> this makes a pattern for a GREAT time with Linkin Park playing. And of course Dead By Sunrise "bonus" songs during the encore.
With that said there is no need for me to choose "one moment" because all the things in my life related with LP are a one big piece of history that will remain forever (I think )