The Samuel seems like the best option to me. I will be using it in the Lian-Li's PC-Q11 case with an inverted fan.
The Big Shuriken rev. B is cheaper though and it won't won't block the PCI-E slots or the RAM ones.
I can't seem to find the Thermalright APX-140 RT, is it a fearly new product? How much does it differ from the APX-140?
Dude! i gave you Thermalright's website link = contains all the possible info needed,including where to buy!
The RT replaced the previous version = universal retention hardware = that's the difference.
Support intel Socket 775 / 1366 / 1156 and AMD Socket AM2 / AM3
with only one fan (which is more than enough for a i3 setup) the height is 66mm. The clearance that sg05 needs, I think it is 82mm. So, height is ok. But I am concerned about what wouterk said.. whether it will block the pcie slot.