a 134 mach will be fine - yes plus temps under load (both cores 100%) are likely, but this is not bad for the mach unit.
For instance an x2 4800 @ 3100mhz fully loaded at 1.6v runs +6 degrees, if you push the CPU higher (in terms of volts) that number grows for few mhz more it's not worth it.
£180 is a great price, £250 is the going rate for a 134 Mach2.
Mav
EDIT: Sorry put correct data in now