Sorry can't help about the devices you're thinking about. But I just wanted to say not to dismiss steering locks too quickly.
I use a disklock (sp?) that covers the whole wheel and it's not as much a pain as I thought it would be. You get used to it fairly quickly and once you've got the knack it's really easy to put on and off without having to get out or open the door.
It also stores really easily in the depression in the passenger footwell when driving and doesn't move around at all. Although you do have to put it in the boot if you have a passenger which can be a pain!
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:<hr /><font size="1" face="Verdana, Helvetica, sans-serif">Originally posted by Donkin:
<strong>I need to park my V6 in a less than salubrious area </strong><hr /></blockquote><font size="1" face="Verdana, Helvetica, sans-serif">Have you thought about sleeping in the car??