Update
CPU is now at 4.8 GHz (1.285v)
HDD's are now a 256GB Samsung 830 & 2x 2TB 7200.14 (with 8TB now available via NAS).
Hyper 212 EVO Cooler has been replaced by a Corsair H100, which (along with the CPU) has been lapped. Added 4x 120mm fans in a push/pull arrangement.
Also had to add some car audio deadening to the case as the sides are so thing the Z5500's bass is making them rattle!
Now I've got some decent cooling on the CPU I should be able to go a bit higher on the CPU, too...
EDIT - and on the subject of PC's, yet another laptop - this time a 13" MacBook Pro Retina to replace my 2011 13" i7 MacBook Pro.