My advice, try to use one of those scratch repair kits and just see if you can fix a small portion of scratched acrylic, this should help you maybe decide on where you're going to go, if you find that it's really not too difficult then maybe you stick with acrylic, if you find that it is a major PITA for you then maybe you go glass.
My own personal experience with both is that the argument of acrylic being way clearer than glass only holds true if you actually keep the acrylic absolutely pristine, my day 1 acrylic tank looked fabulous, however a few years later with coraline growing all around the edge because those parts were a pain to get to, not so much, meanwhile my softy tank made of glass, I take a razor blade swipe swipe swipe and the tank looks like a day1 tank again and WAY nicer than the acrylic. So with that said, I would lean towards glass, do take in mind the glass thickness was 1/2" and I only at extreme angles did I really notice any green tint, which then wasn't horrible, if you go to 3/4" glass all bets might be off, although looking straight through probably won't be that much of a difference and any difference you'll just think is the norm (I really hate those side by side acrylic/glass photos)
There aren't many tanks in the 300g range that are "standard" (Marineland DD is the only one that really comes to mind right now), so that means custom, I would say your choices of manufacturers that are feasible should ultimately make you decide, for instance if you want glass and are thinking Cadlights or Glasscages... then I'd probably go with acrylic made by a monkey with a hot glue gun (aka ATM!

) over them.