After a while, I found Office to be the only truly great CS:S map. The new gfx and physics made that map shine. Blowing out windows with shots, bullet holes all over, bodies piled up, and office furniture and file cabinets strewn all over (including using grenades to make barricades) really made that map seem like a warzone at times.
Almost makes me want to go back to it for a while, as I haven't played it since last year.