Personally I bought my key on
www.allcdkey.com Got a phonecall from them 5 minutes later and 10 more minutes I had my EU key in mail (scanned) and legit.
The one that rang me was a woman, talking english but with asian "accent". So I guess from an asian company.
The key cost $38.
Can also add that for my second account I have a Collector's Edition to claim.

But will nopt claim in until yesterday.
EDIT: WTF? Gamer's Loot WotLK EU key cost $71 (and includes DL). That's robbery. :S