I use the braided 1/4" line from Lowe's It's like $.50 a foot and I get like 15 or 20 feet at a time. I owuld not use the plain tubing. if I had 5/16 fitting i would just keep using the red stuff as it's really chap at the LHBS.
Primary - Apfelwine
Secondary - Niagara white wine
Kegged - AH Special Holiday Ale, AH Cream Ale, AH Honey Wheat
Bottled - Continental Pilsner, Island Mist Mango Citrus, Island Mist Wildberry Shiraz
Up next - AH Foster's clone, Labatt's clone, Hard Apple Cider,
The Independence Street Brew House