Depending on your budget, take a look at the Janome 6125QC, 6260QC or 4900QC. I am looking at the 4900QC myself as I am upgrading from the Janome 6125 which has been and still is a little workhorse, but I want some more whistles and flutes! :D
PS The walking foot and other essential feet all come as standard as well as an extending table and freearm.