I'm worried that if I start using WP-Cache that all my unique visitors and page views won't get tracked. I'm currently using adsense, sitemeter, and blogads. They are all javascript ads that are hosted by the particular site. Will I have a problem?
You'll have no problem with any of those. Each uses Javascript which is run at the browser side, so whether the page is downloaded from your cache or generated on your server the Javascript will still run on the client on each page view (I'm sure I made that sound more complicated than it is ).