I want to replace my aging Parasound AVC-1800, but I'm on a tight budget. Has anymore used or considered using the 1070 as a pre/pro as opposed to either the 970 or maybe 990? Is this a viable option sonically and functionally?

Reason for considering:
970 - has a few bugs that aren't yet fixed.
990 - price for the most part.

Current System :
Denon DVD-1920
Parasound AVC-1800
Krell KAV-500
Von Schweikert VR2000 (front)
Von Schweikert LCR-20 (center)
PSB Image B25 (rear)
SVS 20-39cs (passive sub)
Parasound HCA-2003 (sub amp)
Hitachi 51S700