Well I managed to delid my friend's 3770k in the end ... I baked it in the oven at 80C for 10 minutes to soften the silicon adhesive, then it it took me 2 minutes to take the top off
He was thrilled. Said it lowered his temps by ~15C. I replaced it with Liquid Ultra between CPU & IHS, and he used Liquid Pro as his TIM between IHS & cooler.
When he had it set up again, I was struck by how little heat it dissipates. Whilst I hate Intel with a passion, the summer's just too warm to keep Thuban around ... Bulldozer, Ivy & Sandy are so superior in the amount of juice they need to run at low loads. So I got a 3770k and a Gigabyte Sniper M3 (the mATX board). I'll probably go back to AMD if Piledriver is as much of an advancement as it seems like it'll be, but for now I'm pleased with a much lower power draw ....
I've been setting up today. Again, baked the 3770k, delidded, cleaned, replaced Intel's pig**** with Liquid Ultra, used Liquid Ultra as my IHS -> cooler TIM.
Temps are very good. Max of roughly 65C (lower most of the time) @ 4.4Ghz in Prime Blend.
P.S. I should say that my case is a small FT-03 with only 2 out of 3 case fans installed (Akasa Apaches), and a TR Venomous-X cooler (again with 2x Akasa Apaches in push-pull). So the temps with Liquid Ultra & Liquid Ultra are pretty decent ...