Why not set your alarm for 8:25? I've found that the time snoozing is just time that makes me feel guilty. Make realistic goals, and then stick to it rather than ruining your last half hour of sleep with noise and guilt.

On the contrary I greatly enjoy my snoozing time. When I wake up in the morning i'm at my most comfortable, and drifting off to sleep is nice. Plus I get that weird dream continuation thing going :)