In my opinion, the best route would be to take the general chemistry sequence. I actually know a professor who teaches a course like the one you are describing, and from what she has told me, it really won't prepare you for the DAT and is really watered down. (Side note: Don't listen to amalgam, you didn't cheat the system, you followed the route that was require for your major.) Here is my suggestion, take gen chem and physics next year. The following year, take ochem and maybe some upper level biology and maybe think about retaking the DAT. After taking the tougher level of chemistry and organic, I would assume you should do very well this time. (Your score isn't bad at all, but if you can do that without proper instruction in the subjects, you should do really well the next time).
Another option, if you have the money to gamble, is to schedule ochem for next year, and apply the Summer of 2011 to Maryland and see what happens.
Good luck. Hopefully this is helpful.