Building big cPanel server - how many accounts?

I have experience hosting ~300 accounts on cPanel servers with 2GB ram, 3.0Ghz P4 processors and 200GB drives. It works pretty good, although I'm still working on optimization. I'm looking to step it up a notch. I'm currently looking at buying:
Dual Xeon 3.4ghz
4GB ECC RAM
3.2TB usable storage

Software:
Fedora Core 2 OS
cPanel

Disk space won't be an issue, I can manage that. But how many hosting accounts can I expect to handle? Figure light to moderate use websites, with 20 pop accounts each used. I am just trying to count the cost of buying this server with that much storage.

What are others getting with similar hardware?

Thanks for any suggestions.

 

 

 

 

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