EA or RD?

<p>Hey! I will apply to Adelphi this year and altough not the bestest of all schools, I really like it and it is one of the choices I like most! So I have the following question:
Shall I apply ED or on RD?
I ask this because my SAT is low: CR - 490, Math-680, Writing - 610.. and also my GPA is about 3.4 - 3.5 on the scale of 4. I really want to gain a scholarship or financial aid as much as possible, at least 20-25,000$ so I wonder if I wait till RD when I have my new SAT score (which won't be better, though) and I am taking for the first time ACT in December and maybe rely on those new results. I also have SATII Math Level I of about 610 and in December I will retake it as well as other subject tests, which may be good addition to my application.
I also have many extracurricular activities - 5 years in student council, head of the finance committee, Animal Protection club, 10 years of dance outside of school and etc...
So, what would you advice (: ?</p>