I've been a fan of Sound Forge and Sonic Foundry for years. To me they make some of the most intuitive and powerful software out there.
Personally, I like Sound Forge better than WaveLab, but probably because I've gotten very accustom to it's interface and can get things done faster than with WaveLab.
Both are excellent products though. Of course we have to use the term 'Mastering' lightly. Yes, they will both work well for 2 channel editing, and clean up / touch up work, in the style of Mastering.