Which fan to get??

i am getting the thermalright xp-120 for my heatsink. now, i am confused on these 2 fans. this fan http://www.frozencpu.com/fan-157.html?mv_pc=552 obviously seems better than http://www.frozencpu.com/fan-18.html?mv_pc=576 . why is the M1 much more expensive, if its lower rpm’s and cfm?? they are both the same size fan, and same brand, what gives? and what do u guys suggest, i personally think i should get the " http://www.frozencpu.com/fan-157.html?mv_pc=552 " for my thermalright xp-120

thx bunches

The quieter one. Plus, Frozen CPU is all out of the pricier one.

how come you choose the 29.99 one? isnt it a logical choice to pick the higher powered one, even though it generates slightly more noise ? it moves a lot more air, and is like almost half the price and is in stock…i may have read it wrong, thx for the quick response though : ) but i was wondering if u can clear this up better for me, thx

Note to self: don’t answer when tired.

My bad, dude. Yeah I meant the $16.99 one. 45.5dBA isn’t quiet, but it’s not that loud either…you can do for a lot louder (like a 60mm 7000RPM Delta fan).