For the rest of the world that's £220, €315 and ¥44,000.
You would have to find a HPC2000 device really. So if you like the NEC's you are looking at a MobilePro 790 or 900
(900 not likely at that budget
).
There is a list of devices to look out for here:
http://www.hpcfactor.com/hardware/devices/
My recommendation would perhaps be the 790, as you could jsut move a lot of your applciations directly up to the new device. No need to get new builds for different CPU's.
Other than that on a lucky day there is a chance you could scrape in a hp 710 or a 720