reidhoch writes: "OpenBSD 4.1. has finally been released.This release features tons of new drivers, better support for sparc64, and lots more functionality. With only two remote holes in the default install in more than 10 years you really should check it out. Please user mirrors when downloading."
According to Desktop Linux, Dell will ship three models, an e-series "Essential" Dimension desktop, an XPS desktop, and an e-series Inspiron laptop. The desktop models range from $400 (headless) to $900 and the laptop from $900 to $1150.
I think the choice was obvious — after all, that's the distro Michael Dell is using on his laptop.