Do not aim for 0dB. The goal is to allow for anywhere between -6dB and -12dB (depending upon the specs per mastering house). The reason for this is that the hardware used for mastering (as well as higher end mastering plugins that emulate hardware like waves & ozone) are expecting a signal with a good amount of headroom so it can work it's magic. If you send a track that is already hot, the end product will suffer a great deal because you're already well above the signal the hardware is expecting to get. For example, try adding a mastering plugin (like Logic's AdLimiter) or an instance of Ozone on your master out with your peak signal around 0 before applying the mastering plugs. Then, do the same with your peak signal around -6 – -9 dB. You'll immediately notice the difference in sound.
Personally, I use
KMeter, it was developed by Mastering God Bob Katz and will help aid your mixes in finding the "sweet spot" of headroom for premastering. For $50, it's the best metering tool around IMO.
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