i'll chime in here as I have been thinking about this for a while now...
all good points on the pros and cons.
glass:
starfire glass is an clear as acrylic
don't scratch as easily
but OMG its heavy years ago I have a 240 acrylic and 2 guys could move it no problem. the RS 750XXl took 4 of us and we worked out butts off.
Acrylic:
so much lighter
can do some cool shapes and sizes
Connor polishing
but I hear they can yellow out over time
scratch easy
in that size you are looking for might want to think about the red sea reefer 750XXL I got one over BF and I can say its a amazing sexy tank heck the sump is nicer than any tank I have ever had. comes with stand rimless tank sump ATO res and plumbing for not a bad price.
that said it's HEAVY 3/4" glass so if you want to move it for to have good friends or hired ppl.
when I got this tank I was planning a mixed reef however my coral QT tank crashed now I am moving more towards a fish only and wished I would have gone bigger 240-300+ gallons Acrylic would have been nice there.
someday ( when I build my own home ) I want a room divider massive peninsula tank like 8-10' long 3-4' wide and 2-3' high I dream of it all the time. I am in the same boat glass or acrylic...
I would price them out side my side. and maybe get a nano of each and run that for 6 months to a year while you plan your build and see what you like. heat to droop that kinda $$ only to regret it later on.