Guess I'm in the minority to say I don't think a Bal is suitable as a schoolbag.
Given the amount of stuff that you intend to carry, the handles will really dig into your shoulder, making it really uncomfortable. Unless you intend to just hand carry it by the handles or carry it on your forearm, which basically makes it inconvenient as a schoolbag.
I find that when I overstuff my Work, the bag gets very pouffy and when you carry it on your shoulder, your arm is left at an awkward angle since it can't really hang straight down, being hindered by your bag.
Plus, if the load is heavy, I get "whiskers" emanating from where the handles are attached on my bag due to the leather being stretched by the load.
If that's not an issue for you, I'd advise a RH Work because GH adds significantly to the weight and if you're going to be toting your bag the entire day, your shoulder is going to be sore.
Also given that you can only buy the bag online, there is no guarantee that leather on GH bags will be thicker than RH bags. I've got thick leather on RH bags and thin leather on GH bags. But on the whole, 2010 is a good year for the leather, so I'd suggest getting either 2010 Anthra or Black.
Hope I didn't rain on your parade. Good luck.