Just to exemplify you can get great results [at least, in the technical sense] with very modest, cheap, and dare I say, "old-fashioned", gear. This is a test shot with the Russian lens Jupiter-3 50mm f/1.5 @f/2.8 on the IR-modified Panasonic GF1. Straight b/w conversion in Photo Ninja. Do keep in mind the lens is around 50 years old (and came for free, as my friend Paul H. just donated it to me), and the GF1 is from 2009. So really pushing vintage class as far as digital cameras go.
It's just fair to say that a modified D70S will struggle to deliver such quality for IR photography. After all, the pixel count is significantly lower (6.1 MPix vs. 12-16MPix for the m4/3 models), and the peephole finder hardly offer any improvement either over the mirrorless options. There are plenty of good F-m4/3 adapters available so most Nikkors can be used on the Lumix models too. The only exception would be a Nikkor with 'E' aperture.