Loads of comedy stuff, red dwarf in particular.
Currently on season 6 of dexter on our second run through and considering giving 24 another whirl. Thought about trying Lost again but I'm not sure I can do that to myself a second time!!
X-files looks likely, the whole 9 series box set is about 20 quid on dvd!

With me its movies, I have maybe a dozen "go to" flicks that I've seen between 10 and 20 times.