Well, I can't really comment too much on the DSC panels quality wise, although I've heard their wireless has had some problems. It would still be worth looking into, as there are people here I'm sure who have probably had good luck with their systems.
Some of the Concord line have built in receivers, so they're wireless ready right out of the box. If you eventually want to go wireless, this would be a plus, in my opinion, as ITI seems to have a good reputation for wireless. They seem to be pretty easy to program, too. I have the Concord Ultra myself, and programming, once you figure out the menu and layout, is generally pretty easy. The Express should be pretty similar, although not as many zones on board as the Ultra, which has up to 96, which would probably be overkill for the average residential install.
There are a lot of people here, who seem to like the DSC panels, too, so it could take some time to compare these systems before you decide on one.
Good luck, whatever you decide.