I have a very light (175 gm) "Forte Precision" CF seat post I bought from Performance bike a few years ago for less than $75. I don't think this post is still available from Performance, but I've seen several identical versions from "generic-ish" sources (meaning resellers of generic stuff that put their own name on them). I'm sorry I can't give you any more specific sources, but the post is still sold by indeed light, is sold for cheap, and works .... with one disclaimer.
The tilt adjustment isn't infinite - there are teeth which give discrete little adjustments, but not infinite. I am able to get my perfect angle with it, but I could see that someone with a really, really particular angle requirement might not get it just right.
But if you find a fairly inexpensive CF seat post that looks like this (look especially at the tilt/clamp design), I have had great experience with it: