wierd sound accelerating

The first thing that pops into my head when you describe what sounds like metal scratching against the wheel, is that perhaps your brake pad(s) are worn down to the sensors and need to be replaced. Though, if that were the case, the scraping would probably be constant. It would still be a good idea to check the brakes pads to determine their condition. Good luck.

Wheel bearing, perhaps?

~Brian

If there is a dust shield, have them look at it. Sometimes it's just as simple as bending it back away from the rotor. :-) I had almost exactly the same noise on my '02 WRX and in that case it was just a bent dust shield.. fix was basically a screwdriver for leverage and a quick push.