Here lately we've been using Georgia, which certain purists say is fine for the computer screen but not on paper. Call us unsophisticated, but we think it looks good either way. 12-pt Georgia uses little more space than 12-pt TNR, and less than the 13-pt TNR we were using in pleadings, while looking every bit as legible as the 13-pt TNR due to its taller x-height. It's noticeably different from TNR, but not so different as to give the impression I'm dialing in from a commune in the 9th Circuit.
Because Georgia was commissioned by Microsoft, it's about as ubiquitous as Arial (i.e., your computer probably has it pre-installed -- if you didn't want to pay $100 for a font). But the Evil Empire did well in this instance by its choice of designer, the talented Matthew Carter.
Try your next brief in Georgia and see how you like it!
This sentence is a sample of Georgia per NMC in comments. My HTML code is changing the face but not the size, so for some reason it looks smaller; the effect on the page is that it looks larger than the corresponding size of Times New Roman.(As you can see, I fixed the size problem.)