It's gotta be RIP era line-up for me too. I think it's pretty flawless to be honest.. That's my favourite 'deth album.
Favourite song? Too hard to pick
one, so I'll be a cunt and do this:
Killing Is My Business... - Rattlehead
Peace Sells... - Wake Up Dead/Peace Sells/Devil's Island
So Far, So Good... - In My Darkest Hour (Love the first two tracks too)
Rust In Peace - Holy Wars/Hangar 18 (Fucking classics.)
Countdown - High Speed Dirt and Captive Honour (Just for the intro)
Youthanasia - A Tout le Monde/The Killing Road/Addicted to Chaos/Reckoning Day and Train of Consequences. (I honestly think this is one of their best albums, LOVE all those fucking songs)
Cryptic Writings - She-Wolf
Risk - Erm, yeah. Moving swiftly on..
The World Needs a Hero - I think this album has some good tracks on it. My favs would have to be '1000 Times Goodbye' (For uber comedy value)
and 'Promises' because it's an awesome ballad..
The System Has Failed - Die Dead Enough
United Abominations - Washington Is Next! and Burnt Ice (Great album)
Yeah, I like Megadeth.