MGX or SGX?-gctid1415

I found out about this website I'd say eh, Oh, about a lil' less than a year ago. I called and ordered one, the only problem is, I dont know which one! LOL! As sad as this may sound, I too am having trouble trying to find 'my spot' and yes, I have and am still reading posts on the how to's on this subject. I'm just trying to figure out how the heck I can tell which one of these I have! I even put it up the screen to see if I can't tell by just looking at the two compared to the model I have. I just can't figure out which one it is. Any help would be appreciated on how to tell. If I have the SGX model, then I'm obviously going to have to go the MGX. But if I have the MGX model, then I guess I just have to experiment more.