Hi, and Welcome..
Iīm a newcomer too, but i agree with yuo that this forum seems to have very friendly people that tend to helps eachothers..
Iīm looking for a Rg550 right now ..
, The main diferences between a Rg550 And Rg570 is the use of the scratchplate and the Maple fretboard in the first one..The rest is the same,..both are Basswood,same pups, same Wizard profile neck, same trem, etc..
Although it seems that there are some RG550 with Rosewood fretboard.
Rg1550 and Rg1570 are the new ones with the prestige Neck..I donīt know wath this really mean, but i think it have somethin to do with Quality of the wood, becuase is stiil the same Wizarz profile neck.. Someone know anything diferent? Wood are the same Basswood.
plus the Have the new Edge pro Trem..which iīd never seen or tested.. i have a Jem BSB and the low pro is the greatest one i ever used..i also have a OFR and Spider Khaler and i like the low pro better..
I heard that the early 90īs are the best RGīs but i donīt know is this is real or not..
hope this helps you