Damn, things are expensive on the other side of the Tasman.
Have you got the HAF-XM already or is it included in the water budget?
My advice is to get an EX or RS kit, the RX series is a thicker radiator which has mobo clearance issues in the XM's bigger brother the HAF-X, so definitely will want a slim radiator.
Also a thick rad will require strong fans to reach its full potential, which the XSPC Xinrullian 1650's included in the kit are not I think (their good for slim, low FPI rad usage though).
You will want to read the water-cooling sticky, it will teach you a lot of the background knowledge and concepts behind water-cooling. http://www.tomshardware.com/forum/277130-29-read-first-...
There is a lot of info in there and it will take a couple of reads for it all to click together.
EX series is better and is also slim, but I don't think you can get any 750 pump EX kits, so that raises the price by a good $40.
You hang around in the Systems forum enough to know that the choice of case is subjective to the person buying, if you want the XM, get the XM. If you find a case you like better, then get it. As long as it can hold a dual rad (which is all you need for a CPU loop) your good on the watercooling aspect.
I had a read through the sticky, and i think i have a moderate understanding of it. I will read a few more times though.
As to the radiator i have chosen, i decided to go with the XSPC Raystorm 750 RS240, like what manofchalk suggested. It seems that XSPC have made some good kits in their rasa line and Raystorm is supposed to be just as good, if better. I chose it because it has potential to do more and it will keep my cpu nice and cool.
Is it true that the pump just runs on a molex? I find that hard to believe..
The pump just runs on a Molex, the most a single pump will draw is about ~36W, which a Molex can easily handle. People have been running graphics cards from Molex - PCIE adapters for ages.
If the case fulfills your needs,wants and budget, then go for it. As I mentioned before, case choice is a very personal thing.
In regards to watercooling, its a fairly decent case to be working with. You have the 2x240mm mounts internally, and through the grommeted holes at the back the option of externally mounting a rad is available if you need it.
The X20 750's are well and truly built into the reservoir, cant remove them without destroying the reservoir pretty much. The D5 in the pump/res combo can be removed, you can use it with any other product you like or use it as a stand-alone unit if you got a top for it.
I personally don't like bay mounted pump/res combo's, my X20 750 V2 tends to vibrate in the drive bays causing this low hum, and because of the tight spacing its hard to decouple it (pad it) in any real way to reduce vibration.
But, whatever works for you.
There's a theme when it comes to water-cooling advice here, we wont tell you what to get. You come forth with your idea's and we will comment on them, point out any flaws, issues and possible solutions. Were here to make your transition into water-cooling smooth, not do it for you.
The way I see it, water-cooling wise there is no real difference between the cases. However, I think the HAF-XM is the better case because of aspects that fall outside of water-cooling and just general case features. For instance it has hot swap HDD bays, front USB3 ports, support for larger fan sizes, rubber grommeted cable management holes, the metals used, quality of construction and general aesthetic.
Whether you want those features and whether its worth $60 is up to you to decide.
**Also a thick rad will require strong fans to reach its full potential**
My RX240 like slow fans Chalk, that was one of the strongest points of the RX series,
and the X20 750V2 or V4 is a fine pump you know, Pm me and we'll work on silencing yours for you
@Op, cases are cases are cases mate, Watercooling 99% of the time involves some modding to achieve the result you want, get the one you like the look of, and we can help you mod it to whats needed