I once had to go over a capital budget three times because my shoes made me look " too slick" and the boss REALLY went over my numbers to see I if I was an imcompetent moron based on the fact I had AE burgundy Sanfords on. J&M are passable, but save for a little bit longer and get AE PAs, they will never go out of style at the office. Most people don't notice/care as long as your shoes are black. They can pretty much be recrafted into perpetuity. Once you become established, you should stretch out with the shoes, like black wingtips and monks, but you should play it safe with decent black captoes IMO.
I see plenty of black loafers in the office, not really sartorial correct, but very common, you can get by on the hand me downs tip then, If anybody suggests Walnut Strands for a dog and pony show to the people who sign the cheques, they are idiots. People who sign the cheques can wear anything they want, people who don't can't.