Here's the deal. I can get the rg7420 used, 3 years old, near mint condition, no case for $500 or i can get the rg1527 new from the store, with original hardshell case for $700.
The RG7420 is a cheaper (and older) version of the RG1527 (if we assume that the RG1527 is indeed the RG7620s) successor, so new RG1527 all the way. They're beautiful guitars