Ace,
I wear the Honigs PBS1 Premium Poly-Wool Base Slacks. Very comfortable. Love them.
http://www.honigs.com/detail.asp?Cat=2&Sub=41&Item=765
I just got my Poly-Wool Plate Slacks today too...
DG, of course I can't officially respond for Bob, but just guessing, choice of pant colour would depend on what his partner's wearing...if they're heather grey, wear heather grey, if they're darker, go darker...but as stated, just a hunch...