I prefer KWC too, but like JeremyL said - their database has its limits with certain niches. KWC actually comes in two versions; "Keyword Country Database Viewer" and "Keyword Country Live". Their live version is still in beta, but I have tried it. It still seemed too buggy to get a good feel of. It has the same interface as their "database viewer", but obviously works much slower since it does realtime lookups. Hopefully it will be able to scrape out some more rare keywords and niches.
The 'Average CPC' it gives you is just meant to give you a hint of cpc. But of course only testing can prove the real cpc values.