with three product types, each having 2 levels of discount, this gives you 6 rules.
I would tend to do this via the discounts tab in the ecart object.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.