+1 for Hdplex, great quality and support. See my signature.
Before buying I had the same issue, FC8 Evo or H3.S ? I had no possibility to test them, all I could do: read forums, reviews etc..
I will tell you my personal reasons why I went for the Hdplex. I am not saying Streacom it's not good, as bossanova said, he is happy and has great temps.
1. Motherboard compatibility list - Hdplex website has all the info you need. Streacom has a system build guide. For me it was easier to see if the motherboard was listed there or not.
Before buying I wanted to avoid any installation issue.
2. Weight: 2.5kg FC8 Evo vs 5.5kg Hdplex H3.S
3. Cooling system: Hdplex has more heatpipes and looks solid. It has a heavy, thick copper base plate that comes on top of the CPU.
4. Quick reply from Hdplex to all my questions.