I use the Evolve ATX before but I have to ditch it too for reason of poor air flow and no room to expand and limited rad space. Doing the mod yourself is not for the faint of hearth. There are great and artistic local modders here but they tend to design things more on bling than substance.
I use a 480 GTS rad Xflow because its the only available rad at the time. Using multiple GTS rads really affects flow on my 900D so I end up using a dual D5 pump in serial to maintain 1GPM at idle.
A case that can accomodate a 360 and a 240 will suffice adding more rads gets diminishing returns. On a 35 degree celcius ambient and 37 average water temp with several rads gets 1 to 1.3 degree Delta T at idle. 3.5 Delta T at maximum load both GPU and CPU running 2 benchmarks at the same time.
Gentle Typhoons AP-15 mates well with Hardware Labs GTS rads running from 800 to 1400 rpm in push. Rads are design for the sub 800 rpm. You can still buy original Typhoons from 3dSOJ at TPC for P900. Running push and pull on my top radiator does not make a huge difference 1 to 2 degrees.
If you really want to appreciate water cooling get a fan controller. running those fans thru PWM on a motherboard will throw your fan curves. Those fans will just ramp up and down if the cpu and gpu kicks up on temps.
Cases are available on Corsairs like a 750D to 900D to start. I would avoid cases with glass they have poor temps. Stay away from Mid atx on hot climates they tend to be like hot ovens. you need a big case to breath. There are so many cases available but you have to choose wisely. It does not mean an expensive case with blings will improve you temps. Better be smart than sorry. As I said before its a matter of taste and preference.