Yeah, I've gone the same route as you. I didn't spend $300 on it though. I got my stuff from Deal Extreme.
Initially I tried this wired one and attached it near the boot handle using one of the screws that holds the number plate light in. Problem was then running the wire around the inside of the cabin to the front and to the 12V boot socked to power it. Also, it was useless in the dark. Cost US$35 (free shipping).
So I decided on an infrared wireless option which is a colour camera in daylight, and black and white using the IR at night/low light. This was a much better solution IMO as I mounted it on the number plate, then ran the wire under the boot cover to the jack compartment. The wireless transmitter sits in there and the power then connects to the boot 12V socket. Pretty clean and tidy. The receiver is in the 12V connector at the front. The only gripe I have with the receiver is that it has a 2.5mm jack for the video output, and I couldn't find a 2.5mm female to RCA adapter. In the end I cut the jack off and connected the 2 wires to an RCA plug from Jaycar. The 2.4GHz wireless system works perfectly fine in the Tig and only on very odd occasions do I notice interference (I run with the rear camera always on). Works well at night too, so for US$49 I think it's great value.
Up front I got a 3.5" LCD screen which comes in a nice fold-down form factor. Cost a wallet busting US$52 which i thought was decent. I'm struggling with positioning it though. Initially I had it in the middle of the dash depression, but the wires going down to the 12V socket were unsightly. At the moment I have the wires running under the dash and up the right hand side near the door, and the screen is sitting on the right near the windscreen air vent. Still not ideal, but I'll work something out.
Hope this helps you out though.
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