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.