That thing is spectacular!!! And for only ~ 500 dollars, it is a steal, in my opinion.
1600 will get you an insane folding rig...1600 dollars for two i7-920's and the DP EVGA classified plus 300 or so for cooling loop, a cheap gpu, two 800 W psus.
Imagine the bigadv ppd... If it scales well, probably in excess of 50k at 4.0 ghz (that is where you will need a chunk of ram, 16gb for 16 cores on -bigadv -smp 16