First off, I would like to thank all of you for your input. I do know that assuming anything about the LSAT is quite presumptuous, but I assure you that my 175 estimation is not entirely baseless. I have taken prep courses and practice tests that would indicate a score in the mid-170s is quite attainable, if not likely. I apologize for leaving this information out of my original post.
The reason I phrased it as T5 (rather than T14, HYS-CCN-MVP, etc.) was purely based upon the fact that 4 of the traditional top 5 schools fit very well with the criteria I consider important. My personal requirements do not hinge exclusively on something as relatively trivial as the USN&WR rankings, but rather take into account everything from alumni connections I have, location, future employment prospects, and (perhaps most importantly) the quality of joint degree programs.
My ideal joint degree program would be a JD/MPP or MPA. It is primarily for this reason that I singled out Harvard in my original post. The Harvard Kennedy School public policy programs typically rank in top 2 or 3 in the country and are essentially unparalleled in prestige. When considering the quality of both JD and MPP/MPA programs in tandem, no other school compares with HLS/HKS.
Obviously, I will not make up my mind until I know my acceptance/financial aid status at each of the schools in which I am interested. Until that time I would love to continue hearing from knowledgeable, insightful people about the strengths and weaknesses of all options. Thanks again for all of your time.