Not sure if i should put this here: what SATA controller are you guys using? I was considering Supermicro's AOC-SASLP-MV8.
Since I'm planning to use FlexRAID, JBOD controller is right for me
AOC-SASLP-MV8 is ok for modest performance applications. Do be aware that it is an older design and does not support drives over 2TB, so if you are using large drives - or think you might in the future - then you probably want something else.
A popular choice is to look for OEM versions of LSI SAS2008 based controllers on eBay. These are usually brand-new pulls from "packaged" servers where the end user didn't need the controller. A common model is the IBM M1015, which is essentially an LSI9240-8i with the "raid 5" function disabled. It is electronically close enough to the popular LSI9211-8i that it can be flashed with the 9211s firmware. And if you flash it with the "IT mode" firmware you end up with a passthrough SATA controller that is recognized by most popular OSs including all recent variants of Windows, Linux and Solaris.
You can usually find the M1015 on eBay for under $100, often for $85 or less. Of course, supplies come and go and your mileage on pricing may vary. I haven't look for a while.
This is the controller I am using (though I am running it with LSI9240 firmware). I have three of them running my 24 drives.
There are other similar controllers commonly available on eBay. You can find a lot of info about them at http://forums.servethehome.com