With a price tag of $120 for the big water I would take a TRUE 120 any day of the week for $70. While there is a chance that the bigwater might get slightly lower temps than the TRUE it is not worth the extra $50.
Slay and I have ran i7's comfortable at 4.0 with the true copper and true 120 respectively.
For H2O I would do it right the first time and start with something like this at $201.
Petra's Tech Shop
Way better pump, better block. 2x120 rad vs a 1x120 rad on the bigwater. The i7 creates a lot of heat and a 1x120 rad is not enough.