I was in the same boat as you both last year. I also wanted to take it early, but knew that I needed a fair amount of time to study for it. I decided to put all my eggs in one basket. It came down to - I only wanted to take it once, so I waited untill summer when I had ample time to study. I put in a lot of time studying, and had no other distractions and then took it at the begining of August. It paid off, I did well on it and it didn't seem to slow down getting my interviews. I still applied early (june 1st), besides you have to send your results directly to the schools anyway so AADSAS realy has nothing to do with DAT scores. IMO just plan on taking it once and plan to do well. If you rush into it just to get it done early, then Yes you may want to plan on taking it again.
Just my $0.02