I buy most of my kits from Northernbrewer.com or austinhomebrew.com. Both have good kits with great instructions. Austinhomebrew.com has the largest selection, though! From 'clone' kits to style kits, they must have hundreds of choices. I've done their Fat Tire kit, Pete's Wicked Ale kit, and a few others that I just can't remember right now. But all were excellent!
From northernbrewer.com, I've done their Irish draught, their Irish red, and a friend has done their Speckled Heifer clone (twice!). Those were very good also.