I saw that the Megahalem and CM V8 both had good results......I just feel I'm getting a bit warm with the H70...
I have the CM V8; average performing heatsink. I wish I had the Megahalem, but I will have to do some cutting off of the lower fins in order to accommodate my tall Corsair Dominator RAM. I will do this soon.
Your H70 will outperform air cooled heatsinks any day. If you want to boost performance, look into installing a radiator fan with higher CFMs than the present fan. Accordingly, compensate for intake air by either adding an intake fan, or by increasing the intake by using a fan of higher capacity (CFM).
And make sure that you are using the recommended coolant; not tap water containing minerals which will be deposited on the cooling tubes, thereby reducing the heat transfer.
I ended up swapping out my H70 for a V8 (was able to get a great deal on one from a friend) However........I have no idea how it compares because I just did a major parts upgrade QX9650 -> i5 2500k ......and wow does it run cool (even overclocked to 4.5GHz)
My case is a CM Sniper BE with every fan-space occupied ......I will have to do a side-by-side comparison on this SB i5 this summer.
with the rite fan the thermolabs baram can easily compete with all the above and is way cheaper.
Spire Thermax Eclipse II is 1 of toughs little known but excellent coolers...
it has a massive 95cfm fan