The best extract for almost all styles is the lightest one you can find. You want the color to come from steeping specialty grains, rather than from your extract. The darker the extract, the less fermentable it is. You don't want that unless you're making something Sweet Stout...
Green Lane Brewing
Primary = Evan!'s Special Bitter
On Deck = EdWort's Porter / American Amber
EdWort's Haus Pale Ale Count