Like you I use a Oppo 970 source, but I'm using its analogue 2 channel output into a power amp. I use the Oppos volume to control the analogue outputs.
I don't want to use a preamp either, but I want to improve the sound with an external DAC. Both Benchmark and Citypulse have modern DACs w/ volume controls and switching for one other analogue source. Citypulse's unit also has a remote. I'm not sure if the volume is active or passive (sounds like a preamp to me). This seems like my only option as most sources with DVD capabilty don't have a volume control built in.

