I personally wouldn't put stocks in my Roth IRA. I only have mutual funds in my Roth IRA. I only trade stocks in my cash account.
However, if I had to put two in I would currently pick NVL and CPN. NVL is a more long-term hold while CPN would be a more short-term. I see CPN getting back up to the ~$2.50 range within the next 6 months. NVL should easily hit $30+ in the next year or two.