I use this five-section Manfrotto carbon fibre monopod with tilt head:
It's light and compact - perfect for my needs.
I certainly wouldn't want to stick a heavy tripod head on it though - kinda defeats the object!
Good point. I was just going for reuse.
I'm not sure I need a carbon fibre one as I'm not planning on walking long distances with it on my back. It's more for internal use.
Manfrotto 681B, it's a tough, no nonsense monopod that is the monopod equivalent if their heavier duty 055 series tripods. Since it's only 3 sections it's easy & quick to use, more sections are a pain IMO and are only necessary if you need a compact pod for travelling, ditto with carbon, no sense in it unless you're travelling.
Edit: just noticed it's already been mentioned. You really can't go wrong with it and another thing is that it fits into the dedicated 055 bag alongside the tripod.