Digital BW, The Print

I'm planning to order some 40x50 prints on an Epson 9600 in the near 
future and would be interested in recommendations and advice from those 
with experience printing at this size.

One print shop I contacted has recommended against my first choice for 
paper (Epson premium luster), saying it's relatively thin, so large 
prints are more prone to damage, creases and scuffs. He recommended 
going with a matte paper, like Epson enhanced matte or Ultrasmooth, or 
a watercolor paper. I'm not a fan of textured papers or those with 
flaking issues. What are your favorite paper in this format, especially 
among the luster or semi-glossy papers?

Also, I have an option of getting the prints packaged in 3" tubes or 
flat between foamcore. Any recommendations here?

Thanks