Now, back to your build in question. Since you already ordered your parts I will be nice
No point in trashing your build and recommending alternatives when you already have chosen your parts and they are on their way.
The Core i3 will be a fine choice in your HTPC. Many people go for the 530 but the 540 is a solid choice. The Core i3 series has a great TDP and will run cool in your system. That is always good for a HTPC. Yeah, the Core i3 may not be necessary to run your HTPC but a dual-core CPU will help if you choose to play Flash Video or do some light gaming.
The rest of your HTPC build all boils down to personal choice and it may have helped to read the forums or ask for advice before ordering your parts! You do not have a dedicated GPU and using an internal WD Black drive will generate a decent amount of heat and noise. Since you blatantly stated you are streaming media from a FreeNAS, then why throw a massive $80 1TB drive into your HTPC?! You could have opted for a SSD for literally the same cost.
I am also not a fan of most cases that come with a PSU. The exception to this rule (for me) is Antec. My reasoning is that Antec makes great PSUs and great cases, so putting them together is also great. The Apex PSUs are not rated very highly and a bad PSU can ruin your equipment and also cause other issues along the way.
Sorry if this is discouraging, you may receive your hardware and find that you love it. I just am confused why you would order the parts and then ask for advice and input after the fact.
(side note... I based all of this off of the build listed in your first post. I am not sure if you have kept it up-to-date but I did not want to read back through the entire thread to find if you changed any of your hardware choices).