Is there a specific reason you want another 7 string? The 1527 is a better guitar and I would go with getting another to answer your specific question. But unless you really wanted another identical guitar (or getting the lower end S7320), maybe use the cash towards something else?
This.
the S wont really match up to the quality of the RG, even with the new pups in it.
Though my 1527 is the same cool purple finish and it looks awesome.