Hi mate,
i've worked with all sorts of thermal pastes in my extreme pc cooling days (liquid and phase change cooling) and the best thermal paste you can get is this stuff:
http://www.scorptec.com.au/computer/27889-as-as5-12g
theres also an adhesive (epoxy) version of it here:
http://www.scorptec.com.au/computer/27890-as-asta-7g
and here is their website:
http://www.arcticsilver.com/as5.htm