Hi Aimee,
I have a couple suggestions for you.  Tony Little's Target Training Stomach Reduction video is great.  It's nothing fancy, just basic exercises which hit your abs from every angle.  He has a time clock on the screen, so it is good for beginner to advanced. This is one of his older videos (you can probably get in on ebay for about 2 bucks).  He acts very weird in his newer videos, but this one is good. :08 min. abs is also a very quick, but intense ab workout.  I would say it's good for intermediate to advanced.  I have about 90 exercise videos, so I've tried many ab videos, but these 2 are my favorites for abs. 
Good luck with whatever you get, Laura