Which of the HSF's are better

A little more expensive - about $45 US:
Sunbeam
http://www.newegg.com/Product/Product.aspx?Item=N82E16835207004
Xigmatec Dark Knight
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233029

The HDT style HSF's require a different approach to applying thermal compound.
Suggestions for applying thermal compound:
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=170&Itemid=1&limit=1&limitstart=5

Not quite as expensive (not quite the performance either):
Arctic Cooling Freezer 7 Pro (no link).