This post dates back to 2009 when Amazon was blowing out copies of Native Instruments Battery for $99.00. That has long since ended. However, you can now purchase a full copy of Battery 3 with a massive sample library for less than $200.00 at Amazon.
As a Battery user I have no hesitation recommending Battery 3. It’s easy to use, sounds great and comes with a fairly large library of drum sounds. And as we all know – you can never have too many drum sounds!