Blown Head Gasket?

[Finite Performance]

Plum of grey/white smoke when I put it into neutral as I come to a stop. Also get the same smoke between shifts. No sign of coolant in the oil, still looks clean. Lately I've had some disappearing coolant, but haven't been able to locate the source. I'm leaning towards a bad head gasket, but some input would be nice.
http://i39.tinypic.com/347emgh.jpg

Engine Specs:
ARP head studs
Apexi head gasket
BC 264 cams & valvetrain
2871R turbo
550cc injectors
Tuned using Emanage on 9psi
Bolt-on's

This car isn't beaten on, not really sure the last time it saw full boost.

[Jfitzg38]

With the looks of the compression on that one cylinder as well as the white smoke/ missing coklant it sounds like a headgasket. When I popped kine I also had no coolant in my oil and had terrible compression on one cylinder. Easy fix, just takes a few hours and torque specs.