Do it.
There are no disadvantages besides the fact that if it's a top choice school, you have to sit and wait to go there

No more/less financial aid because if you go in Fall 2010 -- you will have to complete the 2010/2011 FAFSA which doesn't come out until January. All schools I know where you're applying for Fall 2010 admission, won't require all you financial aid information until March. The advantage is a better chance of getting in, because the admissions office won't be drowning in a bunch of paperwork sent in by people at the last minute. So apply, and then send in your financial aid stuff as early in January as you can to ensure you get the most financial aid.