I tend to like Ativan (Lorazepam) the best out of the benzos - it has a shorter half life and doesn't give you the hangover like Valium or some of the other benzos. But talk to your doctor first

On topic, I flew Iberia once, MAD-IBZ-BCN, and while these were short flights, I coudn't figure out why they don't let you use any electronics on board. This is just stupid (along the lines of Aer Lingus).