Just wanted to point out that you really might not need a seperate wave editor because Cubase has a basic wave editor built in. It can do normalization, custom fades, pitch shift, time stretch, phase invert, reverse, silence and quieten. You can also do editing-type jobs that are not really specific to the wave editor, like getting rid of unused segments of files. (Use the audio pool)
If you need more than that, then you'll need a seperate program. I think the major ones are Sound Forge and Wavelab. There are undoubtedly cheaper ones than these, but I'm not really up it.
Jim
