240 or 360 Rad? - Page 2

The Monsta rads are 9fpi but at 80mm thick, they are, well, monsters lol. Apparently they do pretty well with slower fans (sub-1200rpm), but I would personally use the highest static pressure fans whose volume was acceptable to me, as that is a lot of rad for a fan to push through. This is especially important if you can't fit push and pull fans, but if you can fit push pull then by all means do so.
The first fans I would pick for the Monsta would be the Koolance 120x38mm 2600rpm fans which have 118cfm and 6.4mmHg static pressure all for $7-8 per fan, which is absolutely amazing steal for such powerful fans much less ones that use dual ball bearing motors (by comparison, the Corsair SP120 Performance fans have around 3mmHg @ 2350rpm but cost 2x as much). I have the 120x25mm version, identical in every way except for the thickness of the housing (5.4mmHg pressure and 107.4cfm airflow), and I absolutely love them, one of my favorite 120mm fans of all time, with only the Sanyo Denkei 120mm fans beating them for performance/noise/cost.
Using the 120x38mm fans in push pull will give you the best performance you can get from the Monsta rad, which is essentially equivalent to a "regular" radiator that is one size larger (i.e. 240 Monsta = 360 30-60mm thick rad).

If having a 156mm thick rad+fan assembly is less than appealing to you, the UT60 is the same radiator with 20mm less thickness but slightly higher fin density. I am actually using a UT60 240 with the 120x25mm Koolance fans in push pull as an additional radiator to the EX420 I have, and it is extremely nice. The NeXXos rads scale almost perfectly linearly with fan speed, and are (IMHO) the absolute best all around radiator available, period.

Hope that helps! Good luck.