[Q] Back to stock/super stable rom suggestions?

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http://forum.xda-developers.com – I bought my phone on swappa and it was rooted/unlocked/s-off. I put a bunch of different roms on it and have enjoyed using this phone. I sold it today and the buyer wanted stock on it. I told him that I didn't plan on doing that because I don't even know if it's possible. I would, however, like to put something on the phone that is pretty stable. The last version of CM9 I tried was not very good and that's what is currently on it. Any suggestions of what I should do would be greatly appreciated. Thanks. (HowTos)