The top four are probably:
Sony Vegas MovieStudio
Avid Studio (also from Pinnacle, and likely replacing Studio)
Ulead Video Studio
Although there are others.
Two more, though probably a step down in functionality, would be:
Magix MovieEdit Pro
With those two, the common complaint is that their GUI's are just not as good as PrE's. I have both, though in older versions, and use them to Import certain footage.When that work is done, I quickly step over to Premiere for the actual editing.