To be honest dodgeydave, if you want a taxi from the airport to Korat then I'd consider picking up/dropping off whoever, going upstairs to the top level where the local taxis for BBK do the drop-off/pick-up service and just try your luck with the average yellow and blue cab that's around, many will be game, I reckon.
Last time I did it was about 4 years ago and did Swampy to Korat for about 2,500 baht. OK, will be a bit more but most of the average taxi guys, if they are 'up-for-it' will go with the meter or give you a price around 3k or so baht these days I would have thought.
This is speculation but i would also guess that specific services and touts outside the main entrances will try to 'pull your trousers down' over the price.
Guess my advice is to head up to the local BBK yellow and blue taxi drop-off/pick-up point on the top floor that leads out to the roads etc, and you'd probably get a better deal.
However, some of the other experienced posters on here may have something to add and am happy to be stood corrected as it's been a while since I've done it.
