Hey dude!! Sorry for taking so long to answer! The sustain and upper fret access are no problem for me, but if you are picky about your guitars you should definitely go with the Prestige line (on Ibanez)! I bought the S7 mainly thinking of live stuff, where accidents might happen. Don't get me wrong, I truly love my S7 (so confy and light), but the Prestige line is a completely different thing!!
the 7421 in the pic and the 7621 are exactly the same except for pups and bridge saddles. actually my lineup has changed. i no longer have the 7321, or the 7421, or the s7420 black pearl. they have been replaced with a rghrg1 (giger) a UV green dot and a rg7421 XL 27 inch scale 
