OP go with the best FT/HT/field dog you can find from a breeder that actively is involved in trial or tests. You are going to have that dog for 12+ years so might as well get one that has potential. I have heard very good things regarding Krakadawns dogs and Chris Bayles breeds outstanding animals. As to the appearance of "American labs" I have one out of B-Lines Raider, Guage is 91 pds very well proportioned and has retrieved on the order of 5000+ birds in his life. I think he is a good looking dog but I might be biased. LOLAttachment 28552
Here are a few kennels/folks thatcome to mind. B-Line Labs, Kevin Hannah, Scott Rumble, Krakadawn, Luke Scherders WingFeather Outfitters. There are lots more and these guys if they don't have a litter will reference you to someone who does.
Photo is a shameless plugs for B-line Labs and AvianX decoys. ;)