Reg Sherwin Spindle roughing out gouge, page 30, ashley isles catalogue, http://www.ashleyiles.co.uk/Catalogue.pdf H54 or H54A,
Mini continental Spindle Gouge H60M Page 37.
You could get away with either but buy the reg sherwin gouge with a handle and the continental spindle gouge without and make your own handle for the second with the first. I use these two for all my pen work with the exception of the Euro pen kit for which you need a parting tool, H41A (3mm).
Skew chisel is not necessary for pens but is for more detail work on anything else.