I honestly don't know why kyosho is not advertising them well. I would imagine that these little cars would be selling really hot. I do know that Kyosho makes a ton of hop-up parts for the car.
The Micro-RS4 (sorry meant to say micro not mini, two different sizes) is made by HPI. It is 4wd and it had only a few body choices. My friend has one and it is really sweet. I would like to have one also. hehe
Having an SVX cover would be pretty cool also.
G.