You mean Ref-5.32 -> NFB-6 -> Balanced HE-400?
If that's the case, I'd suggest you save money on the Ref 5.32 and get the HE-500 instead...
For the same amount, I'd get NFB-1 -> SA-31 -> HE-500 any day of the week :D
The SA-31 is a wonderful beast! I (much?) prefer it to the integrated amp of my NFB-27 (which, technically, should be a better performer than the NFB-6).
It actually sounds slightly bigger than the NFB-27's balanced amp, which, for a single ended amp, is quite a feat ;)
It adds the convenience of 3 warmth level that make it suitable for lots of cans, even the brightest ones.