As my mac mini (2007) is getting more and more issues (safari crashes, flash player/html5 lags...) I want to get a new system, a hackintosh with the specs written in the title.
I hope that your Mac Mini will hang on just a little longer for you to create a UniBeast flash drive with Mountain Lion to make your life a little easier.
I have two of the original model from 2006, they are pretty slow by todays standards but have served me well. They both still work, but technology gets better as well.
The hardware that you list should work very well for a number of years - it will be as powerful as one of the better iMacs.
My question is if everything will work well in the future and if the same system with 3770 and b75m-d3h would be slower.
I cannot envisage any reason why any well built and maintained computer will not work well in the future. Using a 3770 and B75M-D3H would not make much difference in the speed, the real gains with Haswell are with the 'mobile' processors which can about double run time and also have better graphics - these are important things to consider when buying portable devices.
The desktop chips will use less power and have better graphics - but you have it plugged into the mains power supply and will be using a graphics card. Haswell is one year newer and although there is not any support from Apple today there will be in 10.8.5 and Mavericks (10.9). We will see 10.8.5 in the next week or so and Mavericks probably late October, perhaps November for release?
Adrian B
Edit - one last thing WD green and Blue drives are not good for putting OS X on, use a Hitachi or Seagate. Better still, just add a SSD for OS X and your apps and you can keep your data on the WD blue.
http://www.tonymacx86.com/375-building-customac-buyer-s-guide-august-2013.html#drives
The Sandisk SSDs are in the buyers guide, but the Samsung 840's are good too.