I have used Mr Sunny a few times and always found his cars and drivers to be OK. 1,200 baht all in for the expressway from the airport to Pattaya. I would use him again and certainly recommend him to anyone else.
http://www.sunnyonline.com
I used AKE TAXI THAI SERVICE last time to get from Pattaya to the airport. Located at the junction of soi 4 and second road. At the bottom of the stairs to the Crocodile Bar. I was quoted 860 baht. I guessed correctly this wouldn't include tolls. The driver who picked me up spent a while doing u-turns on Sukhmwit Road looking for a petrol station where he could fill his tyres up with air. Eventually he found one and headed to the airport. He drove I would guess at a steady 55mph. The journey took a good two and a half hours. Never again.