Any airline which has AQP, and does not currently have a bad reputation should be fine.

I would not waste money on CTP. If you're really concerned, after you find out what plane you'll be on, you could buy some sim time on that type I suppose. Assuming it's not all booked up by the regionals. But if you already have an ATP, and have recently flown any jet, or any turbine 135 you should be fine.