Just to be clear, I've never used Ozone in my work, although I certainly could use the linear phase EQ for mastering without hesitation. It can be a very effective tool for home-brew mastering, as long as it's not abused.
These days, my mastering revolves around an Alan Smart C1 and a Manley Massive Passive. Occasionally I'll get a project with the budget to rent a 2-inch tape machine, which is my favorite 'compressor'. I also use the Algorythmix EQs when I need to do precise surgery. On very rare occasions, I'll use a maul-da-band compressor, but only in desparation!
For mixing, I use UAD plugins extensively. The large variety of colors for compression and EQ have made mixing in the box a pleasure. If UAD ever releases virtual versions of the Manley Vari-Mu and the Massive Passive, I will probably dispense of the mastering hardware.