A 360 (triple 120) would be fine. I have never seen a case that supports a quad, only external setups.
Is 800 Litres an Hour high enough?You only need a 240 for that. I run GTX580 SLI OC to the hilt on a 240, ill doubt you will need more surface area. Just make sure the flow rate is high. Also don't get caught up in the order and positioning of things, it makes no difference as it all ends up in equilibrium.