Can you recommend an affordable hard drive controller that will work with these specs?

Hm, do you realize that even SATA III drive transfer rates from platters to CPU are about the same as SATA II speeds? The SATA III ratings are from disk buffer to motherboard. Though faster, for large data transfers between CPU and disk, you are still limited to the disk's internal data transfer speeds. Most 7200rpm disks have sustained transfer speeds LESS than SATA II interface speeds.

SATA III only give a little bit of performance boost, mostly for small transfers via the disk buffer. SATA III is best suited to SSD drives, that have no "data from platter" speed limitations (for HDD)

If you look at the specs for the 4TB drive from the link you give:

http://www.wdc.com/wdproducts/library/SpecSheet/EN...

you will see that the "sustained" transfer rate of the actual platters is 154MB/s

That is LESS than 3gBits/sec for SATA II speeds, in fact, close to SATA 1 speeds !! Yes, the buffer to Host is 6Gb/s, but after 64MB of buffer is empty, you are limited to the "Host to/from drive (sustained)" speeds.

SATA III also will improve things like Raid configurations (as well as SSD mentioned before). Overall, you will get a small improvement over SATA II, but hardly noticeable. Those SATA III specifications are all "smoke and mirrors" as they say, great on paper, but in real life, unless you have SSD, it just is not that fast.

Thus, I'd recommend sticking with your SATA II controller you have, and just run the drive. If you want "performance", you should be looking at Raid or SSD, not SATA III as a solution...

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