$3,000 budget ?

Greetings,

I am wondering if anyone could provide some ideas for how a budget of $3,000 US might be spent building a Hashcat box. Are there any vendors building boxes? The budget may be flexible.

Bonus question, whats the baddest box out there for running oclHashcat, that's been built by anyone in this community? Is PC5 on the benchmark stats (Ubuntu with 8x GPU) the top of the line?

Thanks