Especially since my stolen coins all eventually ended up at the infamous "1FsVcdeHbpvUVT3gjeuVR2ZSDnpcsJMsLL", I am inclined to think that this is more than just some thief working on his own. Whoever is behind this has many "irons-in-the-fire" and is scamming on many levels. Also, he could possibly own millions of USD worth of coins. If that is truly the case, he may not be that anonymous after all.
Just FYI, that address seems to be a hot-wallet of BTC-E. So frequently hackers send the BTC to their BTC-E deposit address (probably as a simple mixer) and after that BTC-E moves it to "1FsVcdeH.." (and after that uses it for withdrawals etc.) For example it's mentioned here after a BTC-E deposit:
http://www.reddit.com/r/Bitcoin/comments/2hv0jd/i_think_someone_just_tried_to_steal_my_coins_but/Sorry for your loss btw.