Are you just starting out, or advanced?
Ankle wts, bands, fire walkers, and a step are all very space efficient. Also, you can take most of that with you when you are traveling. Try to think about equip that is multi-purpose, and that you enjoy using. do you prefer dumbells, barbell, bands?
Of course you don't get any more spac saving than digital downloaded workouts too.
Instructables has some great tutorials of how to make you r own equip. while you save up for the quality stuff that lasts. That is, if you are strappe for cash and space.