I am looking for the same thing. Currently I am running the latest CM7, which is OK. But after seeing ICS and Jellybean, I am jealous.
Will I be able to find a comparable alternative(stability, and functionality) but with either of the newer OS versions?
How is the battery life? I know google says the N1 isnt fast enough, but is that really true? I think I would be quite content with the slimmest ICS rom (something like a stock ICS).
I assume I absolutely need to use Blackrose...I will read up on that.