So looking at these....there is the SG 500, the 600, the 700, the 800, the 1000, the 1500, the 2000, and the 3000 plus the reissued 1820. Seems like the model 1000 and up is an ebony board and the lower numbers are rosewood. and then the 1000 and lower are all set neck while the 2000 is through neck. I think they are all 3 piece necks? Is the 1820 through neck? Any other specs on these anyone can tell me? I think the reissues have 50's-ish necks. How about the originals? Are the pickups all the same across the whole series?