You're the type of rider who wants to go uphill fast and downhill faster. You love how a proper XC bike climbs but hate the compromises it has to make on the downhill; After all, why sprint to the top of the hill if you can't go back down in less than 18 parsecs?
You're probably not the type of rider who is zip-tieing a number plate on at your local races, but speed is still the name of the game.
You want a bike that will make light of most terrain and easily roll over rocks and roots. When scanning the trail, you're looking for the jumps and jibs that can help you straighten out the trail or give you a better line into the next corner. You want a bike capable of taking a square edge hit hard so long as it gives you more speed out of the next corner.