I'm no expert on Korea (vs. knowing how to say "anyong-hashimnika" to my dry cleaner) but I'm surprised that "usage" is a factor in internet costs in Korea? Don't they have broadband by now?
It's great to see your posts, and best of luck with the new gig. I'm jealous of anyone who plays the guitar well - I have piano fingers, and have come to the conclusion that anyone over 15 who attempts to learn guitar just can't do it...