Hey 1969,
I think that the best thing you could do would be to identify the brand/model of the bird if you can. That would not only attract many more responses with useful information but also allow you to search through the forum list and most likely find existing posts on the subject while waiting for replies. Just for starters though, Thunder Tiger Raptors and Century models seem to be some of the most popular nitro models so you couldn't go wrong with one of them. I have a TT Raptor 90 and i love it. I can't be completely sure on the cost not knowing the conversion rate for Korea but i invested about $1,600.00 in a stock Raptor 90 without radio. That included the stock kit, OS 91 SZ hyper w/pump and Futaba 401 gyro/9254 servo combo in addition to all necessary field equipment. I guess $2200.00 w/radio wouldn't be such a bad deal if it is indeed like new and maybe assuming that it included a few upgrades with the guy being a champ and all. Good luck and thank you for your service!