OcUK 2 rotates between Italy, Office, dust2, assault, aztec and tides at the moment and isn't modded at all. (Sourcemod is on there for admin purposes only). See this thread: http://forums.overclockers.co.uk/showthread.php?t=18044192 for more info on the ocuk css servers.
I could make it a full rotation, but I don't know who would want to play on maps such as de_port etc...
However I may add both de_nuke and de_inferno at some point if people want them.
Do themmmmmmm!!! Just so I know there are still people playing those maps even if I can't

It fill up often ? nuke and inferno would be great too.

I might install 1.6 and see what it's like these days - I still remember the first time I managed to hit 100FPS in CS, it was on oilrig with a brand new Nvidia Riva TNT2 32mb - cost me all my pocket money did that card