Which 5.1 ch Pre?

Hi: I do not need processing, just preamplification (gain + vol. control) for a 5.1 ch set up, less than $2,000 demo or gently used. Here is a short list:
- Copland CVA 306 for its tubes
- McCormack MAP1 as it matches with my CDP UDP1
- Audio refinement Pre-5 for its very low cost
What would you recommend? Did I forget an obvious option?

Thanks