Have you already committed to the glass-holes overflow? Having recently run a Herbie-style on my 360g, followed immediately by a glass-holes 1500gph on my temporary tank, I can tell you that while the glass-holes are about as nice as an open-channel drain can get, they're still much louder than a full siphon (i.e. herbie or beananimal) drain. Unless you're dead set on the glass-holes drain, I would definitely go with a full siphon drain if you can.
For comparison, the glass-holes was on a tank with a mag 12. Ran full-bore, it sounded like a typical open channel (i.e. durso) drain - like there was a gently bubbling brook in your living room. Not the end of the world, but the herbie drain on my 360g was DEAD DEAD SILENT and it was running against a pump three times the size. Like, literally ZERO noise other than the hum of the pump. Both drain systems use a pair of 1.5" bulkheads so implementation requirements are about the same - the herbie drain needs to be in a slightly larger box, but that's no big deal on a big tank IMHO.