I use the Performance truing stand pictured above, which I bought on sale for $40. Even when I worked at a shop and had dishing tool access, I just flipped the wheel around in the stand to see how much difference there was. So I don't think you much need a dishing tool.
I also don't use a tension tool, options instead to work by feel and by
tensioning spokes by ear. The link was recommended by Sheldon Brown. (This method may not work for those without a musical ear or the ability to carry a tune.) I think a tensionmeter probably IS worth having, but it's not that big of a deal and I've not felt like paying the $50 yet.