I've got the MV Agusta Corse one (the one from Design Corse). Its my first HID kit I've installed myself and I wanted something that was supposedly guaranteed to work which it did. I also wanted to make sure the colour was right (white and not blue) which it is and matches the LEDs nicely.
The next one I would save the money and get one without the label and packaging and just use the same specs.
If I remember correct its a 6000k bulb and 30W ballast.
The only thing I'll say is that if you're buying OEM Chinese from eBay, what's written on the sticker might not match what the unit actually does. Although there have been companies selling for a while now, so feedback should be reliable if you check up how long they have been on there.
$200 does seem pretty salty for a warrantied one though...