I'm also looking for a Les Paul but can't afford anything above $500 cos I'm unemployed at the moment and have to save wisely.
I tried the Epi LP Std at G77 which was going for $800 flat and that one is limited edition, which is red with matt finish. The body and neck feels smooth and satin like, not sticky/lacquered like most LPs. It had a very good tone and had a great time playing Rush tunes.
The GL-300, I reckon, doesn't have the matt finish (which I'm looking for when buying an LP, I always hated LPs becos of their sticky/lacquered necks)but seeing that its almost half the price of the Epi LP Std, I'd take the GL-300 and save myself precious amount of dough. I will have to force myself to get used to the GL-300. I've not yet tried one but might be getting one soon this week if it feels and sounds right. The reviews on the Internet have been good so far.