Got it..

Got a firm job offer from JLP (via Canadian Connections) for either 옥과중학교 or 임자중학교. Not sure which I'll take yet.
Imja is an island about 2.5 hrs from Gwangju. School is nice and small. Bus to Gwangju from the nearest port is about 15nzd, ferry from Imja to the mainland is about 5nzd. Pay is a little higher but that would go towards visiting Gwangju every other weekend. Probably not going to get any sailing/winsurfing/kayaking in as the school is in the middle of the island. So..
Okgwa is a small town in Gokseong county about the same distance from Gwangju as Damyang. School is a bit bigger at around 400 students. Accomodation would be in Okgwa itself though there are buses to Gwangju reasonably often. The town looks suitable for a spot of riding and theres a reservoir nearby which looks good for a spot of r/c yachting. Pay is just the normal for my level but still good. Yeah..

I still have no idea which to pick!