There really is no such thing as a
good inexpensive fluid head for video - you generally get what you pay for.
To look at the huge price range, I would start
hereWhen space and weight are at an absolute premium, I reluctantly use one of
these, although operating it is pretty bad and it needs a
leveling base to be usable.
If I was buying today, I would likely get a Miller.
Whatever you decide on, try it with your gear and do not buy 'blind'