There's a few different flavors of the JVC to choose from, some with and some without a CD player. Below are the Crutchfield links, though you can find them cheaper at other places. Crutchfield is the way to go if you don't mind spending a couple extra dollars to have all the right pieces. Their customer service is top notch.
JVC KW-M750BT
I have the older version of this one without the CD player, the older generation is the KW-M730BT. The model series in JVC's numbering is KW-M7xxBT for the Android Auto/Apple Car Play without the CD player, xx stands for the generation. The version with a CD player has an V8 instead of M7.
Version with the CD player.
Here's the Crutchfield link to the
VW1 Maestro wiring harness.
Crutchfield's customer service can help you choose the steering wheel adapter. You can ask about the
Maestro RR, but there's cheaper options that could be available for steering control.
For a backup camera, any cheap one off of Amazon will work if it has an RCA cable. I prefer the 10-20 dollar ones that sit behind the license plate. They don't stick out like a sore thumb. There's no need for a fancy VW designed backup camera since the head unit has an RCA input.
If you're interested in exploring the VW look alike units or retrofits from newer ones, there's a thread that's currently discussing this:
http://forums.tdiclub.com/showthread.php?t=503249