I have had several conversations with people over the past few weeks discussing which desktop Mac I would recommend for the law office. I have two Mac minis in my office, but the iMacs are excellent machines.
A post today at Mac360 addresses the iMac vs. mini debate. That article concludes that "dollar for dollar, feature for feature, the iMac is actually a better value than a Mac mini, even at twice the price. But if your need for feature parity are less, then the Mac mini saves you plenty of money."
Source: "Mac mini vs. iMac: A Good Value Or An Expensive Toy?" by Kate MacKenzie, published at Mac360.