The whole DCS range is pretty good. Blackshark was on offer on steam for like £7.99 which is why I bought it. Up until then I was still playing EECH and Enemy Engaged 2. If you're interested, check out DCS World. It only has the Frogfoot but if you like that, you can buy the Warthog, Mustang and Blackshark packs from the site that integrate them into DCS world. You can also get Lock On:Flaming Cliffs which includes alot of aircraft (just not as in depth and detailed as the A-10, P-51D and KA-50).
I'm still trying to master the startup procedure of the KA-50. Though it's pretty hard when my dad is round yelling at me that I'm doing it wrong. Bloomin backseat sim players....*grumbles*
*edit* Not sure if it's allowed but check here for DCS world - http://www.digitalcombatsimulator.com/en/