which of the above albums is arnold layne from??
Arnold Layne didn't make it onto an album. It did appear on Relics, but that wasn't a real album per se. More an early greatest hits.
Gilmour and Wright did Arnold Layne on Jools Holland there last year. Its on YouTube, as is the entire Live 8 performance - but that consisted of tunes that its hard not to hate due to saturation (thanks in equal parts to Waters and post Waters Pink Floyd)
The Final Cut is a fantastic album. I'm slightly biased, but as far as I'm concerned, everything Pink Floyd did before Waters left is fantastic. Everything after is crap.