If it will fit in your case, over your RAM and clear your PCI-E slot Silver Arrow SB-E Extreme for £51.78 is probably the best air cooler available
There are three SA SB-E kits but fans are the only difference.
SA SB-E = 1x TY-141 & 1x TY-151
SA SB-E SE = 2x TY-147 (same as TY-140 but black housing & white fan)
SA SB-E Extreme = 2x TY-143 (look like TY-140 but red housing & orange fan with more powerful motor / airfllow)
TY-140/141/145/147 = 74cfm @ 1300rpm
TY=143 = 74cfm @ 1300 but 130cfm @ 2500rpm. Sound the same to 1300rpm but gets louder the faster it goes.
Control fan speed using motherboard PWM CPU socket. I advise using a PWM splitter that has molex/sata connecter to power fans. TY-143's draw .6amp each. Other TY-140 series fans draw .2amp.
Advantage of SA SB-E Extreme is performance is identical to other up to 1300rpm.. But if you need it there is about 7c more cooling available at higher fan speed.