I have always played CSS from day one at maximum from the Athlon XP days to my current GTX SLi.
I currently get over 350fps happily in the benchmark and on UKCS a 64 slot server which is almost always full and i get 90fps on that at LEAST.
I do however have a fairly behemoth computer and upgrade to make sure my relaxation method (online killing ) is at its peak.
Check my the pic for the stats picture of CSS, 3DMark06, SuperPI and PIfast. Using Mali's config which goes DX8, reduces all the detail so it looks i get in the 700s