CAVA Sizing Information

Wondering if anyone has any real world sizing examples for implementing CAVA on their Celerra? I have run the CAVA sizing tool, but would really rather hear from anyone who has really used this and found the best solution. I have heard an AV server per 500 connections is a good rule but again would just like to hear about anyone else's personal experience with this. My Celerra is quite busy, on average around 2000-3000 CIF's connections with CPU use around 75-85% during peak hours...