There are no “realistic” A-10 flight sims on the market today and I believe LOMAC will be as close as you can get when it hits the shelves. Don’t get me wrong there are some fun sims out there but most are either old, like A-10 Cuba, or built on another sims flight models and avionics, like falcon4’s A-10 add-on.
Jane’s USAF has nice graphics but it comes nowhere near representing a real A-10, it even has an air-to-air and air-to-ground radars.
LOMAC has A-10 maintainers and A-10 pilot(s) working on the project to insure it is as close to the real thing you can get in a PC flight sim.
Ugly but well hung!
http://www.warthogpen.com