Hadoop cluster build, machine specs

[Ted Dziuba]

Hi all,

I'm looking to build a small, 5-10 node cluster to run mostly CPU-bound 
Hadoop jobs.  I'm shying away from the 8-core behemoth type machines for 
cost reasons.  But what about dual core machines?  32 or 64 bits?

I'm still in the planning stages, so any advice would be greatly 
appreciated.

Thanks,

Ted