I need a replacement for my last Linux laptop; and the Studio 1558 is attractive with the quad core i7 and 1920x1080 display.
What touch pad is included? I've got the X synaptics driver configured to be well-behaved and syndaemon setup to ignore the touch pad when the keyboard is active so my mouse cursor doesn't get spastic.
Does xrandr work for changing between the laptop screen and/or external displays? I did that with the Nvidia driver and found it extremely convenient for moving between home, desktop, and conference room with a projector.
The alternative is a Thinkpad W510 with Nvidia and synaptics; although for the same hardware configuration and on-site warranty service it's easily $750 more expensive.