Who will get Toro Rosso seat #2?

Today Toro Rosso confirmed that 2008 Red Bull test driver Sebastian Buemi will fill one of the two available race seats at the team in 2009 (see here), leaving just one more space open.

We know who are in the running: Sato, Bourdais, and since Honda's pull-out Jenson Button, Rubens Barrichello and Bruno Senna have also been linked with STR, so who do you think it will be?

I personally think, and hope for, Sebastien Bourdais, purely because I have a bet with Mike.

Senna will most likely get picked up by another (faster) team, I'm thinking Button tbh

I see Sato.

Lol of course you would, it's a domain name away from Bourdais