So I should hold off buying the 105 for now you think? Would my ys-60 strobe be a good fit when using the 60 mm? Could you put up a link to the 2x teleconverter you mention?
Yes, that's right. I'd hold off on buying the 105mm for now. There is a lot that you learn and explore with the 60mm.
A 60mm micro with flat port (with focus control if you can afford it (FP-FC60)) and YS-60 should be a fine system to start with. You can add a second strobe if you want later on.
I use a nikon TC201 teleconverter, but I wouldn't recommend that model. It doesn't allow you to auto focus or change the aperture inside a housing and it won't work with the D70 for anything other than 100% manual exposure. Besides, they don't make them anymore.
I've never used, but I hear good things about the Kenko pro converters. As I understand, you maintain full control of your lens (no Auto focus with AFS lenses I think). Maybe someone else can comment on these specific converters?
You should be able to use the same port with an extension ring when you're using the teleconverter (I use 40mm Ext ring).
Cheers,
Mike