Stalker SoC: I played it with the Oblivion Lost 2.2 Mod and Arsenal Mod, which are two awesome mods that even the people that made the game recommend and are the two most well know mods for SoC.
Clear Skies: Clean from the box, I only god a mod to fix the lagging problem that CS and CoP have for some reason because X-Ray engine sucks ... I also go a Texture pack to make it look a little nicer
Call of Pripyat: Got my Russian friend to buy the Collectors Ed. for me and 1 day ship it to the US a week before the US release. I also got the mod to fix the lag problem for CoP.
Oblivion Lost Build 1945: It was cool to see the lost maps like "The Generators" where the monolith base was originally.
As a treat for you, straight from Russian hands and sorry if this is the wrong one because I have crap internet, but I think this is it >w>
http://www.youtube.com/watch?v=hT-wUR0LFaY&feature=relatedanyhow back on topic ;3 I agree wasted is a strong term indulged is better