Personally, I still enjoy building the odd machine here and there; I don't do it for the common run of machines at work - "Dude, you're getting a Dell", and before anyone says it, we use Optiplexes, which are a very different kettle of fish to the Dimension home systems - but do every so often for special purposes, like several media centres that I built to run plasmas and a box that serves as a network renderer for 3DStudio Max. My own workstation's a self-build as is my home machine (actually that one's more a self-re-build, and Scan now own my soul). I just like picking and choosing the bits for myself.