I don't know about all the area's Catholic schools, but I know St. Matthew and St. Gabriel are both very good. Even if your child will be waitlisted, don't lose hope! I know people who were way down on the waitlist and still got in. If you do get on the wait list, I would recommend calling regularly (particularly into the summer) to find out where you stand on the wait list. Your child could get in even a week before school starts. As lovesmountains said, there are buses to Holy Trinity Middle School (buses leave from St. Matthew, among other places). You would need to apply very soon, as applications have been accepted since January. They accept applications until the spots fill up. Here's a link to the website - you can apply and fill out the forms online. Good luck!
MACS