There's only one part of my motherboard which is noticeably hot and that's the "VRM Coolers"...
...Another question, where would I find screws that would go in a push/pull setup? they'd need to be 3-4inches long atleast?
That is indeed VRM heatsink. It gets warm because it doesnt have anything actively cooling it, but not to worry, they can take more abuse than CPU's and generate less heat. Unless you've actually noticed any performance drop due to VRM's, there is no point in messing with their cooling unless you fancy the look of motherboard blocks (which i myself do). The MOFSET block for your motherboard is made by EKWB and by Heatkiller. I cant link you the heatkiller block without linking their shop but i can link the list of compatible ek blocks
here. The only reasons to replace your motherboard heatsinks with these really are either because your VRM sink get's in the way of something (mine was touching my radiator fan) or because you like the look, there isn't any performance benefit if you suffer from no VRM problems.
As for the screw's, most radiators come with enough screws to fit all the fan's, if not you can just use two screws per fan instead of 4. If your fans are 25mm thick, you need 30mm long ones, which should be supplied with all rad's. The size of the screw thread you need depends on which radiator you get, i think XSPC use m4 and EK use m3 but dont quote me. Google for them, they are quite easy to find.
When i chose my first loop, i looked at EK's kit as a guideline as to what i would need, then i would replace parts to suit me. I replaced their normal waterblock and pump for the high end versions and the tube reservoir to a length i found that would suit the size of my case. I also had to change the radiator to suit the size that my case allowed. In the end the only thing i really kept were the fittings and the tubing. lol
The V12 kit is pretty perfect if you want to include your GPU, the 360mm radiator will be up to scratch. From what i have seen on reviews and posts on this forum, the block is on par with EK's supremacy and dont get much better. The fans are as good as you can get for radiator fans. The only qualms i have about the kit is that they come with normal barbs instead of compression fittings. 1/2 inch barbs with 7/16th tubing are just as secure as compression fittings with matching tubing but are a bit more fiddly to install, on the up side, they are a tad cheaper.