I bought Brio-r some time ago, so the price is out dated, expect 6k+. Powerful or not also depend on your speakers. For my little MA GX-50 and listening area, volume button at 9 o'clock is normal and never over 12 o'clock. So still half way to go.
I have consider their DAC seriously but please note that its USB is only supporting up to 16-bit and 44.1/48k. This will limit its use on CAS. Hopping they will upgrade it soon.