Okay, first, on the steering. Yes, I've noticed a weird sound sometimes, but it's not a squeak. What it sounds like is rubber rubbing on plastic, right inside the steering column shroud somewhere. Daily driving it's not there, just when I'm manuevering at low speed and turning the wheel from lock to lock and back and forth when parking. Ours is just something rubbing I think.
And the thunk. This could be one of a few things I think, and we do have a clunk here or there every so often. There's the usual posi-traction (limited slip) clunk when slowing and then getting back on it. And sometimes, but rarely, I've also noticed a thunk of some sorts sometimes, sounding like a hard shift in the transmission, usually at the same slow and go times. Your's could be anyone of a few, but this is just an idea.
Neither of these problems is even remotely noticable on our Av though, it's just that I'm a problem finder and am looking for odd things all the time.
There are two annoyances I'd like to get rid of though! An annoying squeak underneath the driver's seat over bumps or other movement, and a rattle above the back window that's been there from day one, caused by a looseness somewhere around one of the latches and the trim panel over them.
Other than that, it's terrific! Good luck with the squeak and thunk (there's nothing I hate more than weird noises in a new car!).