I purchased my 2011 Nissan Xterra from Power Nissan and felt they were highly customer focused. I was very pleased with the entire process and absolutely love the new truck. I would definitely recommend their sales department and would go there again.
Update as of August 2012 - still loving this truck. I even made a video describing some of the features I like: http://www.youtube.com/watch?v=f-IQB9u0sE4&list=UUSZgIbvZItJr78kHY3Y9wnA&index=7&feature=plcp