Suggest that he read reviews of the bike at www.roadbikereview.com. Motobecanes are typically reviewed, but it would be worthwhile to read reviews of the specific bike and retailer he's considering.

I generally like to support local shops, but I think he should get the bike that most excites him to ride. It is possible to build a relationship with a shop regardless of where you buy the bike. There are good and bad shops out there, so the mere fact that it's local doesn't necessarily sway me one way or another.