DeHavilland UltraVerve or Shindo Aurieges?

The Shindo is very good and hard to beat for the money. It would make that system much more musical for sure and I would bet it could use it.

I can't speak for the Dehavilland but everyone that's heard my Aurieges has loved it. Just keep in mind that the impedance on it is quite high, 5,000 Ohms, so you have to be careful about matching amps with it.

It works with just about every tube amp I've ever come across. Most tube amps have a 100K ohm input impedance- no problem. Its just not a concern. The alternative to lower the output impedance of a tube pre is add more tubes or add an output transformer. More tubes is not an option sonically. Ouytput transformers are a great option but they cost.

The speakers (VMPS RM30M) are 4 ohms, the preamp (Shindo Aurieges) is 5K and the amp (NuForce 9SE V.2) is 45K. I'm afraid I am not good with impedance matching - does anyone know of any good books or sites that explain it well?

I've done a bit of reading already and I am now confused as to what gauge wire I should use for the interconnects (30 gauge not large enough?).

Does the above system match well enough impedance-wise?

I believe the guideline is that the impedance of the amp should be at least 10X the pre, so at 45k its on the borderline.... I believe that my Bedini amp is about 45K Ohms, and it does work with my Aurieges but YMMV. Maybe one of the experts can chime in....

However, if you match with a tube amp, like what Jonathan said impedance matching is less of a concern.