Sorry, I have to challenge that statement. The action on an angled neck can be set every bit as low as on a guitar with no angle, assuming all other things are equal. If anything, having an angled neck tends to make the action *lower* than on a guitar with no angle - that's the whole reason necks are angled.
Mich'Boy: Your post is unclear - you say that you lower your bridge as low as it can go without buzzing, and it's still high. This has *nothing* to do with neck angle, it has to do with how level your frets are, and how much relief you have in your neck. If (as you say) your relief isset right, and the nut height is good, then you need to level your frets to get lower action without buzzing.
If you're actually saying you lower your bridge *all the way till it touches the body* and the action is still high, then you may have a neck angle problem, but the problem would be not enough angle, not too much.