Since I'v only played for 2½ month (mostly 10 seats SNG's), I'm probably not the best qualified person to answer...
But I'll give it a shot and hope that someone with more experience will give their 5 cents too.
I would say that you should call with (see the link in the bottom):
AA-88 (perhaps a few more like 77 and 66)
AK,AQ,AJ
I wouldn't be calling with a king high since there are roughly a 16% chance of him holding an ace (4/50 + 4/49).
http://www-personal.umich.edu/~mlerner/poker/fancy.html
Direct link since I can't find any link on the mainpage. Credit to the guy who made the page: Michael Lerner and the guy who wrote the program that made it possible for the first guy to make the page in the first place: Andrew Prock