I have an Epiphone SG. It was only like $200 new, and when I got it, it needed a slight fret job (filing down a few frets that were sticking up too much I guess), but once I got that, the action was fantastic. With that, combined with adjusting intonation, it became as good as any Gibson SG I've ever owned or encountered.
Yours probably needs the fret job as well, since I suspect that it's a common deficiency they have coming out of the factory. Here in California it cost me as much as the guitar did, but there in Thailand I'm sure it won't be nearly as expensive. Just be sure they know what they're doing. My fret job was done by a regionally famous luthier and guitar tech to rock stars, who was pretty full of himself, hence the high price.