Do you've already the SRM-006?
If not, then there are a lot better and cheaper options.
In Germany you'll e.g. under http://www.high-amp.de
the Antares, which blows the SRM-006 away and can also drive a SR-007.
I'd a long time the SRM-006 and two Antares, one Elektra, one DS-50 and one Luminare (from AudioValve). All these amps are superior to the SRM-006.
Also the DS-50 is a good one (try to get it from Denmark), which is fine for the desktop, but it lacks a bit in the DAC.