I'm assuming by "touchpads" you mean the HP TouchPad. I believe that iPad is the best choice. First of all, it's the most popular tablet in the world. All those other Android Honeycomb tablets and wanna bes are nothing like iPad. The build quality, apps, software, and everything "just works" on iPad, and all Apple products. It's no wonder Apple sold 11.8 Million iPads in Q1 of 2011- and only 1 million Android tablets combined sold in the first year. iPad is popular, and always will be.
There are a variety of touch pads brands you can get and they include HP, Apple, Huawei, Toshiba, Dell and Smart board. They are at affordable prices in stores like Amazon.com, eBay.com and eBuyer.com.