Nick Heidfeld - Widely rumoured, he's by far the most obvious answer to all this, but with some sources claiming that Merc is going to be an "international" team and don't wish to settle necessarily for a 2nd german, well that kinda works out against him. The biggest problem is PR-wise - while a duo of world champ brits at McLaren is a PR dream, a duo of germans in Silver Arrows is going to remind people of unpleasant images from a distant past, when Mercedes and german nationalism racing success was unfortunately heavily connected to the nazi regime. Therefore I'd imagine they're rather eager to NOT have 2 germans in the squad. However, looking at the other options in the market, Nick's position still seems quite strong. The whole "we want Merc to be an international team" might be just damage limitation in the PR camp while they line up Heidfeld for the seat.
Adrian Sutil - The other quick german in the market. Adrian's quite quick, but he's got a bit of a crasher reputation and most people would prefer the guarantee of solid performances that Nick would give, whereas Adrian is a bit more of a risk. Specially when they already have a promising guy for the future in Rosberg. The german thing works against Adrian as well.
Michael Schumacher - Well, he's the one german guy whose PR benefits would outweight the negatives. Would make headlines everywhere, and he would be a "big surprise" as Lauda hinted at. But his age and his dodgy neck makes him a huge risk.
Robert Kubica - Another possible "big surprise", because he isn't supposed to be in the market. But with Renault taking ages to confirm their plans, and Glock strangely choosing Manor to sign for, could be a sign that Renault is about to stop existing. Or maybe it's just a sign that Vitaly Petrov and russian money is about to enter that team.
Heikki Kovalainen - On the market and not german, but on a severely weakened position after two very poor season at McLaren. I think they'd much rather go with Heidfeld than with him...
Paul di Resta - Well I'm just going to start listing some crazy options. Paul is linked to Mercedes in DTM, and is famously the guy that beat Vettel in F3. He's not german and would make quite a surprise - because he's a rookie! Being 3 years away from racing in open-wheelers, he'd probably be a little out of form in them and therefore another huge risk.
Jamie Green - Another DTM guy, another F3 champ, except he's been away from open-wheelers even longer. It's not going to happen, but hey, if I'm listing Paul, got to list Jamie as well. Gary Paffett doesn't make it to the poll because he's more of a McLaren than a Mercedes man...
Ralf Schumacher - Another random DTM guy
Jarno Trulli - Well, he's a front-running F1 driver still in the market, isn't he? But everything seems to point towards a move to Lotus or even NASCAR!
I'm going to be boring and vote Nick, btw.
