Ideal IDS/IPS

What would we like to have in an ideal IDS/IPS system? I am not
restricting the list to existing approaches such as signature based,
anomaly based, statistical or specification based IDS. Just trying to
get the wish list sort of. Any feedback is much appreciated.

Low false negatives   - maximize detection and prevention of
intrusions, detect zero day attacks, detect variations
Low false positives   - don't waste analyst time
Ease of use           - installation and configuration
Low resource usage    - minimize resource usage, degrade gracefully
when resource usage exceeds limits
High Performance      - good scalability with increasing network speeds
Stability, Robustness - no crashes, and resistance to attacks againt IDS
Minimal ongoing maintainence - Run with minimal human supervision

Thanks

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