Where can bankers get the best insurance, 401K, and office perks? This year, Guggenheim Securities and Perella Weinberg Partners switched the #1 and #2 spots, edging out Harris Williams & Company -- whose score improved by nearly .60 of a point in one year. The big takeaway? Investment banks are lavishing more benefits on their staff, with 9 of the top 10 firms earning higher marks than the year before.