Actually, the one who directed Aliens was James Cameron, also known for doing the Terminator series (but not Terminator 3). He would be a good director for AVP2, because he seems to have a talent for action movies. The only thing is that he doesn't seem to be very interested in these kinds of movies anymore. Last we know, he was doing the Titanic, and I haven't heard him doing more movies since (probably ones that didn't get much recognition).
"There are five possible operations for any army. If you can fight, fight; if you cannot fight, defend; if you cannot defend, flee; if you cannot flee, surrender; if you cannot surrender, die."