Everything CAN be set up in Vegas. It's not the most flexible tool for creating audio CDs, though.
If you like Vegas, keep going with the Sony software and purchase the bundle of Sound Forge and CD Architect. CDA is a VERY complete CD authoring package.
Also, you'll get the Wavehammer direct-x plugin with SF, which will give you some opportunities for decent loudness maximization. For dialog and narrative it's probably all you need. This plug can also be used in Vegas and directly in CDA.
An amazing mastering plugin is Ozone from izotope.com, if you wanted to drop another $300 for that last little bit of quality, but there's nothing wrong with Wavehammer.
Of course this is all on the assumption that you have good monitoring and will actually be able to hear the effects of this processing.