Switched recently to a Sig P245, but the Officer's Model is still my favorite.
I really can't carry a backup anywhere legal under GA law, although I guess I could have it in my purse as far as I'm concerned that's just a free bonus for purse-snatchers.
The shoulder rig was great for the Colt, and back when I was tossing weights about much more vigorously than I can manage today, the extra width across the shoulders made it visually impossible to detect... I also found that an ankle holster works well with comfortable jeans. Since you mentioned slacks, have you considered one?