First of all: is 3.1 your LSAC GPA or your undergrad GPA? The main difference is that the LSAC GPA factors in courses that you've "retaken" (much to my dismay as I went from 3.51 to 3.37).
Second of all: use this. Its your friend. Its the LSAC admissions calculator and will give you a REASONABLE expectation about admissions chances. http://officialguide.lsac.org
click on "LSAC Data Search" and plug your numbers in; rank according to "likelihood" not alphabetical.
Third of all: Don't assume you'll get on the top or bottom of your range. You are deceiving yourself if you think you will hit the "top" of your range (I should know- my top was 178). And the "test day decrease" is a myth too. Most people score somewhere in their range. With a 160, your worst case, your "reaches" would be the lower-T1 schools (25-50) like Wisconsin and Wake Forest. Your "reaches" would be T2 schools like Temple or University of Oregon. And your Safeties would be T3/T4 schools.
With a 165 your fortunes would change. You can pretty much forget a T14 unless you are URM or have GREAT soft factors and a lot of luck. Your reaches would be schools like Notre Dame, Fordham and Boston College (35-15). Your reaches would be lower T1 schools like Wake Forest (50-35). And your safeties would be T2 schools like Temple (50-100).
Again look at the LSAC Data Search for more comprehensive info.