Here's some stuff from the WOtC boards:
http://www.wizards.com/default.asp?x=dnd/news/20070116a
In this, they indicate they started at 11th level AND they had a TON of players.
I'd would suggest starting at 10th level and reduce the "noise level" in the dungeon. That's where where I started with my conversion, and it worked out fine and completely conveyed the "flavor" of the original.
http://www.wizards.com/default.asp?x=dnd/news/20070116a
In this, they indicate they started at 11th level AND they had a TON of players.
I'd would suggest starting at 10th level and reduce the "noise level" in the dungeon. That's where where I started with my conversion, and it worked out fine and completely conveyed the "flavor" of the original.
