Here is another useful tool for finding "high value" private universities and SLACs. These are schools that are either the most generous with financial aid or the most generous with merit aid, or both.
http://www.kiplinger.com/tool/college/T014-S001-kiplinger-s-best-values-in-private-colleges/index.php
You can sort these lists by a number of variables, including the average amount of non-need aid awarded. This shows that Duke has the highest average non-need award amount ($55,000) and the percentage of non-need students who get merit awards (7%). The average merit award at Vanderbilt is $25,000; 18% of students without need get merit awards.