Brewers best kits are decent. A few are excellent (their imperial blonde is a great kit)
northern brewer has good kits
AIH has good kits
Williams brewer has good kits
Right now, since you are doing extract, it's good practice to pop out a few kits to get your process down, just figure out what kinds of beer you like and go from there. With Extract, the fresher the better. Most of the online stores have their recipes posted (the hop schedule), so find a beer you like (like bells two hearted, or sierra nevada, whatever) and the look for clone kits.
get your process down..