wavelab is very nice but I also think that T-racks 24 will get you pretty far, pretty much depending on the mix, if the mix is good, the t-racks can finnish the job, if the mix is halfgood wavelab can fix it, if the mix isn't good, there isn't a program in the world that can fix it.
Yeah I recently got Ozone 3, works really well I found. My mate who runs a professional studio used it to master my bands album, which sounds great.
But at the end of the day if you dont have a good mix then you wont be able to do much with mastering anyway.
Mixing is far more important than mastering, which is more kind of finishing touches really.