I second the vote on the Nautilus. Real easy draw, and it has adjustable airflow. Of the four options, I usually use one of the two middle ones (if 1 is the smallest hole, and 4 is the largest, I primarily use 2, sometimes three). If you have the largest hole selected, you'll definitely have enough air.
Some of my cheap ones are pretty air too, I have a $5 Smoktek NBC and I can't complain about the pull at all.