The CSV-5300 is the same as the CSV-5300U, the later is our USA/Canada part number. The CSV-5300H is the HDMI version.
Now, the CSV-5300A is our latest model, this one has the latest STDP 4320 chip from ST Micro and is DisplayPort 1.2a. Also all the latest models have a scan/reset button on the back of the device, making easier for your graphics controller to recognise it.
If you have more questions let me know.