I found this resource very helpful as we began searching for the right breeder:
http://www.brookhavenlabs.com/FieldBuyerChecklist.html
We ended up getting ours from YBR Farm and he is an absolute sweetheart (sure was Winston).
Be prepared to wait 6 months or more from any reputable breeder. Many have waitlists and some will even interview you. Also, any breeder worth its salt will have you sign a contract which, among other things, requires that if you ever have to give up the dog you must contact them and they will take it back at any time for any reason.
Good luck
Labs are great companions and