I'm using Simply Stunning v1.0.2 overclocked at 1.1ghz. It also has smoked glass theme. Love it. Smooth, fast, stable (even with 2.1 launcher). I can push it to 1.25ghz, but I was getting some random restarts with that. Chevy says thats fixable by using the 1.2 kernel, but I just haven't tried it yet.
Oh, and I went to this ROM from Sholes 2.0.2 (based on android 2.0.1) so I had to data wipe since Simply Stunning is a 2.1 ROM. Installation was a breeze, and the result is pretty awesome.