Grad school Admission question

[Etats360]

Hey, I'm currently in the process of applying for grad school. I want to send applications to 3 or 4 safe schools, 3 or 4 reach schools, and 3 or 4 schools where I have a good balance of the two. What is a good resource in finding out how likely I am to get into a program depending on GRE scores, GPA's, etc?

Edit: also, how important is taking the GRE subject test for my area?

Thanks