Why liquid cooling on the CPU? Seems like needless expense and risk of catastrophic (and messy) failure.
Why move from a 670 to a 980? That's usually a budget-blower right there.

The CPU, yeah, I can see that. And upping RAM from 8GB to 16-32GB is definitely a winner.

Here's why I ask those first two questions:

My system:

* i7-2600K w/Noctua NH-U12P SE2 CPU Heat Sink With 2 Noctua Fans (avg. temp 5-boxing + netflix = 47-59C)
* Intel DP67DE reference board (no sexy logos or laser-cut, finger-slicing heat-sinks, but I cannot kill this thing)
* 32GB 1600MHz RAM
* GTX580 3GB
* 2x256 840 Pro SSDs in RAID 0
* 3x Scythe S-Flex silent 120mm fans
* Your basic CoolerMaster Centurion case

I run 5x 1080p windows, with main at about 90% of Ultra and 45-60fps everywhere, with some clever macros to limit the background windows. And I watch Netflix. And I surf the web.

How much of a performance bump are you expecting or desiring?