Budget is anything under $110, which would need to include the swapping out of any fans needed to make a cooler quieter.
Would run either CPU at stock speeds initially, but may try a mild OC down the road if temps can be kept in check. Longevity is as important as speed, as this will be my main home computer for the next 3-4 years. Currently running an E6750 Core 2 Duo system, so you can see how often I build a new system.

I don't know for sure, but I think both stock fans on the NH-D14 (NF-P14 and NF-P12) are 3-pin and not 4-pin PWM - so not controllable via Fan Xpert 2, right? If that's the case and both fans would run at 100% all the time, should I should plan to swap out the fans for PWM fans?
With the Megahalems Rev C, I would buy 2 PWM fans to plug into motherboard PWM fan headers. I believe the ASUS P8Z77 mobos with Fan Xpert 2 have two CPU PWM fan headers, right?
Sorry if these are elementary questions. Thanks in advance for the education!

J