I was looking for message alert sounds, and I hit on the idea that the airline single-ding and double-ding tones might work. They're designed to be brief, while getting your attention. They work fine on my 9700, so I've put them on a site where people download them directly. Here are the links:
http://www.beepzoid.com/ringtones/airline-1ding.mp3
http://www.beepzoid.com/ringtones/airline-2dings.mp3