"First, tell him to find a different shop!
I'm bigger than he is, and the only consideration I had when I bought my new bike was:
1.) No carbon fiber
2.) Nice wheelset"
+1
I'm 6'7" / 275# and ride several different road bikes(see my sig.)
The wheels and tires are my biggest concern....along with putting the seat back and
getting a nitto extended stem...with those I can ride just about any size frame I choose!
....but I choose to ride 64-67cm frames because they just plain look better
I am currently riding my '89 Paramount with a set of Mavic Cosmos laced 20 and 24 and they
have held up for quite a while....very lively ride I might add.