#1
im having difficulty deciding which one...ive played the S520EX and it was amazing... but how much better is the S470DXQM? and i plan one switching the pickups with some dimarzio D sonic(bridge) and evolution(neck)..good choice for metal? and everything in between?good cleans on the evolution?

I really like the S470DXQM because of the color and the extra pick up...but is it really that worth it for 50 bucks more?

The S470(blue)
http://www.musiciansfriend.com/product/Ibanez-S470DXQM-Electric-Guitar?sku=519933

The S520(green)
http://www.musiciansfriend.com/product/Ibanez-RG3EXQM1-Quilted-Maple-Top-Electric-Guitar?sku=518873
#2
Neither is better. Those guitars have absolutely identical feel and assembly quality. The 470 is worth more due to the quilted top, which the 520 doesn't have. They would be great for metal with the right pickups (and more importantly right amp).
Fender Japan Stratocaster Ibanez Pro540 Power Ibanez Pro540 Saber Ibanez 430S Ibanez S540 Charvel LSXIII w/GraphTech Ghost MIDI Parker Fly Artist Ibanez S1220 Mesa F30 Roland GR20 Roland Microcube + IBANEZ TREMS STILL SUCK!