I'm finally looking to exchange a few of the BTC I've been holding on to for the last few years as I need some money for a new startup.

I've registered and verified an account with Bitstamp and made a test SEPA withdrawal for just under $2000.  Everything went fine and I received the funds in my account.

The sum I'm looking to withdraw now would be around 1 million USD.  Since the average balance and transactions of my bank account have never really exceeded a few thousand euros, I'm worried about setting off some alarm bells.

Has anyone had experience with this?  Is there anything I should be aware of to avoid any hassles? 

I've had problems in the past with bank accounts being frozen since i travel constantly and send money worldwide regularly.  It was some anti money laundering measure they had in place and I had to convince the bank that I was really just sending funds to myself for living expenses abroad.  Took nearly three months to resolve that last time and I would like to avoid this if I can!