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I did a lot of research on this one... I had a tight budget, but I wanted something light, portable, strong and stable. I found one that is excellent for my needs.
Sirui T 1204X G 10 Carbon Fiber Tripod Ballhead Kit 6952060000060 | eBay
I have found it to be well made, durable, easy to carry. It is strong and stable. For the price I personally think that it's hard to beat it, and it comes with a great bullhead to boot!