Favorite Past Ultra Premium PCs

What is everyone’s favorite past, ultra premium PC?

Me:

The 2006 Dell M2010 laptop/desktop convertible. One of the most interesting PCs of the time. It had Centrino Duo processor, 2GB of RAM, a detachable keyboard and a desktop like monitor!

The Sony Vaio UMPC line. It had a Core Solo Processor, 1GB of RAM, and Windows Vista. A full fledged computer, in such a small form factor!