I use the Lyman Inside/Outside Deburring Tool and really like it. You can use it by hand with the provided handle or you can take the head off the handle and screw it into your case trimmer to debur that way. It's a fast and efficient way to dress the case necks after trimming.
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I prefer to use the lyman VLD for the chamfer then I use the RCBS for deburring the outside of the case neck. I like the more gentle angle of the VLD chamfer over the harsh 45deg angle of the regular chamfer tool.
If you are going to do large batch processing of brass for a long progressive loading session I would invest in the RCBS or Hornady case prep stations.