Help...how do I configure this sale?

Hi,

I seem to be having a problem trying to figure out how I could calculate the following quantity discounts into the cart:

each DVD is 24.95ea. up to 5 items (0-4)
5 DVDs is 99.95 or
5-12 DVDs is $19.95/ea.
12 DVD's is 199.95 and each item after 12 is $16.66ea.

The problem is this is only for the dvd category, and not other items in the cart.

I did download and install a module for quantity discounts, but unfortunately, it's far too limited and still doesn't handle the type of discount I need to accomplish this because it's only per item, and this is per item per category. Grrrr. I was also trying to see if I could configure this in sale maker, but I'm stumped as to how to set this up. I'm posting, hoping that the more experienced zenner may have some creative ideas. I've searched the demo cart for solutions, the help section and installed the additional modules with no success. I'm in desperate need of help. :frusty:

Many thanks as always for your help and energy.
Kinget