I want a (well-trained) dog

So now I'm hooked up with a corner of the dog rescue community. Melissa, who found Parker, found out that I'm in love with the Burnese Mountain Dogs, expecially the markings (like Neve), and she forwarded me the info about a Swiss Mountain Dog mix named Nemo. I spoke to his owner, and he sounds like a sweetie, although he's got some aggression issues with the two other dogs he lives with around food. (Would it be bad to have three living together in a household who are all obsessed with food, even if it's not the same food?) He's big--85 lbs., which isn't a problem in itself, but could be if he is really aggressive and hard to control. He's 2 or 3 years old, and seems to respond to training, but isn't getting the time and attention he needs in his current household with the two other pooches and a 4-month-old baby.

He lives in North Carolina, but his foster parents are coming to West Chester later this month and are willing to bring him so we can hang out for the weekend. I'd love to meet him, but I'm already dreading the idea that I'll adore him but know he's too much for me to handle. This dog shopping really reveals what a novice I am, and I have to keep reminding myself it's okay to go through a learning process until I know enough to make a choice.