Got myself a power cage I built from scaffolding. Seems to hold up very well, although I'm not really able to squat serious weight yet because I'm puny and weak. My bench is a cheap york job that shakes all over the place and really could do with replacing. The scaffolding doesn't look as good as a proper power rack. I can imagine changing the position of the bars gets annoying if I was using it to spot for my bench press.
I would like to retro fit a pulley system to my rack in the future but thinking about it a cheap power cage may have been less hassle.