The Shinobi XL is a beast for sure to be able to house anything you might have, more than its little brother. It would be the best opportunity for me to start a new watercooled system. Since I am new to water cooling, I'll just start with cpu cooling and get a kit. I quite like the V10 watercooling kit 360 that put up together by the OCUK Tech Lab, though I prefer the XSPC bay reservoir. I'll stick to kit until I get some hands on. However, after going through forum, I know that that Laing pump and EK supreme HF cpu block are popular for good reason. So here's what I'm going to put into the Bitfenix Shinobi XL, if I got one.
1X XSPC EX360 120mm Radiator - Black
1X Laing 10W DDC-Pump 12V DDC-1T
1X XSPC Acrylic Tank Reservoir for Laing DDC (or may be the XSPC bay reservoir later)
1X EK Supreme HF CPU Waterblock - Copper Plexi
3X Scythe Gentle Typhoon 120mm 1850 RPM
1X Mayhems Ultra Pure H20 Watercooling Fluid
2X XSPC 7/16" ID [16/11mm] Clear
2X OcUK 1/2" Barbed Fitting G1/4 - FatBoy Style - Black Nickel Finish
good luck.
btw, the watercooling reference guide provided is very useful for beginner like me. thanks.