i purchased some 3rd hand codexes awhile back, and 40k as a game does look very interesting, but i have no money for sinking into paints and models and such, especially with (currently) pre-teen nephews and a baby niece running about. (nevermind more important things to try to spend for, to build My Life with.)
however, i do like the look and flavor of the tau (with some added star wars clonetrooper flavors) and the various space marines chapters (of course

).
also, based on the psychotic bipolarism/ multiple personality disorder of GW as a company, and im really not inclined to officially buy anything from them.
if i thought i could pull it off, i would make my own models (especially the vehicles, buildings, and other set pieces), based on gobs and gobs of photos and measurements.