[V12|V12]

I'm once again debating if I'm going to revert to my old shrouds or make 2 new ones?

1) The old 120mm
*Pro's: Quiet | adds air flow | mobo cooling | don't have to make new shroud | Other case fans aid in pulling in more air with less RPM from main 120mm | can use fan bus

-Con's: Adds extra heat from HC into case |

2)The old 172mm
*Pro's: Same as 120mm just MUCH MORE air and completely silent!

-Con's: Same as 120mm | Takes up more space |Can't be controlled with standard fan controller(25W!) (I just direct wire it to PSU for 5-7v)

3)The New 120mm Triangle
*Pro's: Quiet | adds NO extra heat to case | Best case temps so far | can use fan bus

-Con's: Potentially louder at higher speeds- since air is directed outside case bottom (Fan closer to me since it's near case front) |Takes up space very close to mobo | Have to make new shroud

4)The New 120+80mm Box
*Pro's: Same as triangle | +More air flow than triangle | Would take up less space

-Con's: Same as triangle

Please tell me what you think! All set ups are super quiet and case temps are great... the 120mm Triangular setup I have in now is a Card board prototype and isolates Heater core temps from raising case temps, as I'm going to either rivet or braze together a tin metal one for this current triangle or proposed BOX.... Here's some MS-Paint's of the setups and proposed... THanks!