I used to have CM6.1 on my last phone (an HTC Hero) but I'm liking the pure stock experience of 2.3. I'll probably end up rooting my Nexus S within the next few weeks anyways for a work related thing, but I plan on just running a stock ROM with custom kernel, probably one with BFS and overclocking, though I have yet to run into any apps other than benchmarks that would have any noticeable benefit from overclocking.
A little off topic, but why did you choose Netarchy over the various Trinity kernels?