I don't see why it wouldn't be a safe OC. Good temperature, and if it stays stable under heavy load (gaming,
SETI@Home, repeated benchmark runs, etc.) then you should be home free. Besides, it's the exact same core used in the 3200+ (11x200) just sold at a lower stock speed (11x166). If you bump your multiplier back up to 11 you'll have a 3200+
I'm planning to get a 2500+ very soon myself and run it at a bare minimum of 11x200 - voila, a 3200+ for $85 instead of $450!