If you are desiring both high-end cooling and quieter than the Delta38 screamer your choices are few. Here are my top 3 recommendations:
1.) Millennium Copper Glaciator http://www.millennium-thermal.com/
2.) MightyMachine (a Thermalright SK6 variant) http://1coolpc.com/welcome.html
3.) the NoiseControl Silverado which may be a bit short on cooling power for 1.4 MHz.