I like some of the Schecters, others not at all, but that's with any brand really. (I'm 46 and very not goth btw lol)
Silver Mountain is a cool guitar, but;
A. Make sure you can see the exact guitar before ordering, because every one is different, some look great and some look OK.
Sweetwater does have that going for them with their guitar gallery you can pick which one you like, and new shipments come often so be patient and wait for the right one to find you.
B. Don't trust Sweetwater specs for anything, any brand or model, amps or guitars. Just go to the Schecter website to study the various model specs.
C. Definitely spring for a model with the stainless frets, like the Silver and many others that are above the $1000 mark, well worth the extra couple hundred.
D. If you like conventional neck pickup tones you might not like the sustainer at all, hard to say.
I have one with it and that's fine for something different, but given a choice I'd pick a regular neck pickup over the sustainer everyday and twice on Sundays.
E. Silver Mountain is very lightweight and extremely beveled, almost too much IMO, but part of that is just having so much wood routed away for everything.
The non-floyded models without the sustainer are not as super-light. Sweetwater also has each unit's exact weight listed in the gallery.
F. They will knock some off the price, if you ask of course.
G. Never have a new guitar routed for anything IMO, it's a recipe for a torturous disaster!