If you are going to bite a bullet, go for the Areca ARC-1882LP
It has double the cache memory and this memory is much faster, 1333 instead of 800 and even though Newegg does not mention it, it supports PCIe-3.0 instead of PCIe-2.0. If you bite an even bigger bullet, consider the Areca ARC-1882iX-12 which not only adds extra ports, but also has upgradeable cache memory up to 4 GB.
The 12xx line is pretty dated, it used an older processor, not the dual core on the 1882 line, uses much slower cache memory and is only PCIe-2.0.
You are trully building a killer system here. I completely agree with the two Areca options Harm mentions as a good match for the rest of your build.
Only I would say, "bite the bullet", to match the rest of your system. Not, "if you are going to bit a bullet...".
Thank you Harm and Jim,
For saving me some money but at the same time costing me more.
One more question can I or should I install the Areca ARC-1882ix-12 on a fresh Windows 7 pro install or can I install the card after Windows is installed?
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It does not matter when you install the card, before or after Windows, because you have to setup your array(s) in the Areca BIOS outside of Windows and only then can format the array(s) in Disk Manager.
Looking at your pictures, I assume you do not plan to use side panel fans, because currently the front and rear fan are in a push-pull configuration. The rear pulling air into the case and the front pushing out the air. Normally I would have assumed a reverse approach, pulling in from the front and pushing out at the rear. Check out this page: http://ppbm7.com/index.php/news/cooling but maybe I did not see the labels on the fans correctly in your pictures.
Yes, I have 1 200 mm side panel fan do you think this will be adequate?
I was also thinking to retrofit dust filters at all intake fan points.
There is also a bracket for a 140mm fan on the back of the hard drive bay I am going to use a Noctua http://www.newegg.ca/Product/Product.aspx?Item=N82E16835608034
I looked at you link and I will be doing the math to get a balanced positive cooling system for the chassi.
Your attention to detail is very appreciated.