This relates to an earlier topic in the thread, but one that I'd like to share as an encouragement, anyway. I have been admitted to four programs this year: two top ten, two ranked somewhere in the twenties, and wait listed at two others (both top ten). My GPA is okay (3.6), GRE's pretty good (Verbal: good, Quant.: miserable, Writing: miserable), but nothing exceptional overall. I also come from a little-known college in the South. At every school, the DGS indicated that my writing sample was what got me in. My numbers just (barely) got me through the initial cuts.
All in all, if you and your professors think you've got an excellent writing sample, you have a crack at getting into a top program. While fit is a crucial matter, departments still want the best. The most tried-and-true indicator of success in graduate school and beyond is, in the end, the writing sample.