I have a similar setup to what you are proposing. My office system speakers are Dynaudio BM5A's, which use the same tweeter and amps as the Focus 110A, but have a larger woofer. I used to use them with an HSU VTF-1, but replaced that a while ago with a VTF-3 MK III when I upgraded my HT sub. Both are being fed by a Benchmark DAC-1 PRE.
I listen mostly to rock as well, and IMO that is the Dynaudio's strength. The expressive tweeter makes rock a lot of fun. They'll also play plenty loud. I have briefly turned them up to the point where the amps go into clipping (indicated by a red LED on the front of the speakers), but would never listen for extended periods at those levels - it's just way too loud.
They also have the switches on the back that allow you to tailor the sound somewhat to your room or liking.
I had some PMC DB1+'s previously, and the Dynaudio are much more satisfying for rock. They're much more detailed and can play much louder without breaking up. Perhaps the newer DB1i are better, but I didn't feel the PMC were very good for the money. The build quality felt really cheap and the knuckle rap test confirmed it. The Dynaudio's have better build quality and higher quality drivers. Also, PMC's cheaper speakers are not really active; they are just passive speakers with amps bolted onto the back. The Dynaudio's are true active speakers with all the benefits that active crossovers and optimized amps bring.