Most conventional transducers respond well to reasonable helpings of clean current. The Focus series is of no exception. Give em' some extra juice and they'll sing like angels. That said; their voicing and simple/efficient crossover will let you squeak by with something like the NAD C325.
When you gather up enough funds in the kitty to move on up the amplifier chain, I would highly encourage you to look towards tried and true synergies from the likes of Sim Audio, Naim, Krell or even NuForce. Of course, there are plenty of fantastic options that I'm missing out on. Oh well, that's a bridge you will have to cross when you get there.
Moving onto Totem real quick; I forgot to mention that the Model 1 does exhibit better low level listening behavior (to these ears, at least). In my experiences, Dynaudio products tend to come more into their own once a bit of volume is applied.
Also, its true that Totem uses the HiVi driver. However, my understanding is that this driver is used only in the Forest. I believe the Model 1 uses a bona fide Dynaudio driver, and I know without a doubt that the Mani 2 Sigs do.
Anyways, good luck!