Larry's Bicycle Plus is supposed to be great. See KC.
http://larrysbicyclesplus.com/
http://larrysbicyclesplus.com/articl...nners-pg54.htm
+1 on Bicycle Habitat
Sid's on 34th Street is also a good place, but he will need to speak to Ashlei. She's the best.
http://www.sidsbikes.com/
Also, he can visit the New York Cycle Club message board (open to all) http://www.nycc.org/mb/threads.aspx?B=1 and start a thread about best bike shops, or do a search for past recs.
ccnyc
2006 Serotta Concours/Terry Butterfly Ti