I'd probably end up in Durmstrang which is...well, so much more awesome.
But...none of them have an inch of common sense (teachers or students).
Dumbledore is creepy with the constant twinkle and showing up wherever. Also, he's a moron.(Get a Marine with a sniper rifle -> Voldemort issue solved)
I'd probably end up in Slytherin (read: most definitely) and half of them will be Death Eaters. On the other hand, hey, cool metal band name. Down side again, Lightning Face and the Gryffindorks will make life hell.
I'd be without my computer, cellphone or other stuff that make life worth living. No wonder Potter got into so much stupid trouble. Get them the Internet and they'll be quiet as a mouse all day.
Every kid in that school will know how to make lethal poisons or kill me with a spell. I'd be so paranoid, I wouldn't get out of the broom closet.
Snakes, owls, toads and rats everywhere. The castle would be shaking in its foundations due to my daily screaming at vermin.