+1 to Northern Brewers Kits. I am sure some of the others are good too. But, I have used NB in the past, as well as using their recipes..... Always been good.
Midwest and Northern Brewer are my go to guys, have also not been disappointed in RiteBrew. Windriver brewing also had good kits, I just hated the LME in a bag.
Just did a rye ipa from Austin came out incredible and going to try my Irish spring stout soon. Austin has good prices great flavor and good shipping prices