HW recommendation

[Vladimir Kushnir]

Hi!

Please folks, I need some help. I'm in desperate need to upgrade my 
AMD64 (s939) box - need much more CPU/RAM power to do both CPU- 
and memory-intensive computations.
So here is my obvious question: which are the last supported chipsets/CPU 
and so on (I'm thinking along the line of AM3 AMD-based MB plus Phenom II 
- they seem to be a bit cheeper)? Is there any sence to look for the 
newest (AMD8xx) based MB, 6-core Phenoms, SATA III, USB-3 or they aren't 
going to work?

TIA,
Vladimir