I have already listed some of the basic tools that are useful with polymer clay.  Like a pasta machine,  it is not totally neccesary but makes conditioning clay much easier.  I would recommend buying a better one then going for the cheaper ones.  They all work the same but cheap ones tend to break and give you problems.  I have seen pasta machines at thrift shops and garage sales.

Another basic tool is a surface to work on.  You can use almost anything.  I have tiles, a table and cutting broads (not wood) that I use.  I do not re-use any of them for food stuff after I have claimed them in my craft room.

I also have an old small food processure that we no longer use for cooking.  It helps with conditioning really hard clay.

Some of my favorite tools are my cookie cutters.  I have many of them from large to small.  I really love the butterflies and flowers. 

I also have a bunch of shaped cutters that you find in the scrape booking area of the local craft stores.  They are really easy to use and make great shapes!