Agreed, I'm not sure where all these 6-12" Ancistrus species are coming from but they seem to be "popping up" a lot lately...
If you are going to go with a single bristlenose pleco, you may want to look at a long finned instead of a regular short finned. They can be truly spectacular fish in my opinion.
I have never heard of a BN getting to 7". They rarely get to 6" in an aquarium setting.
http://www.planetcatfish.com/catelog/species.php?species_id=1940
Agreed, I'm not sure where all these 6-12" Ancistrus species are coming from but they seem to be "popping up" a lot lately...