I actually have a survey up at http://www.dayshoe.com for when I was considering making a minimalist office shoe, but the realities of the shoemaking industry and importation overwhelmed me (especially when dealing with big and wide sizes), so I put it on hold for now.
Here's a couple of things that I wear to work regularly with fairly minimalist soles:
I have these in brown and black L.B. Evans Finn driving moccasin and I have no problems with forefoot striking, even though the heel seems a little thick.
I also have these Route 66 Nolan slippers in brown and black but they are obviously not as nice, but the sole is very thin and flexible. So far no one has given me hassle about them except one guy who also owned the Route 66 Nolan in brown and said "Why are you wearing slippers?" But this is a business casual environment, I would not wear any of these to an interview.
Today at a resale shop I saw a pair of these Drillmasters Marching Shoes and was surprised at how thin and flexible the soles were. They weren't my size, but I made sure to look them up just in case. They are also all synthetic, which I'm not into.
I have made some of my own shoes just by removing the sole and replacing it with a SoleTech 144 sole using Freesole but my first try just mangled it. :) I hear shoe repair places can do it for around $30.
I even had a guy on eBay make me a pair of jazz dancing shoes with a minimalist sole, but he ended up using a flat plastic sole instead. Thankfully it was cheap. Jazz dancing shoes like these are almost perfect, just get rid of the heel and make the sole more waterproof and you're done. Or just wear them indoors at work.