I've also read here and other places dozens of times not to make the application about a specific community, "You are seeking a commission FIRST...". My first choice has always been IW. I've had extensive computer training, even code writing, since middle school. But I've been lead to believe thats what the interviews are for, not the application. Is that not necessarily so?
I certainly had an aviation emphasis in my motivational statement. I had initially wanted to put intel as a third choice and later removed it to leave only SNA and SNFO.
If you're applying to more than one community you may want to broaden it out some more. If you're being more specific then by all means include why you want to be in that community and what you have to offer.