Irwin83r,
We have the perfect class for you, it's called 2F \"Production Sports Cars\".
Everything you mention is achievable, it'll just come down to how much compromise you want to have between a \"daily driver\" and \"race car\".
I recently purchased a completely stock, road registered, NA8 clubman that I planned to race. I have since stripped out the interior put in a roll cage, a few other safety items, put in some good brake pads, good fluids and semi slick tyres and now I'm racing. I'm not entirely sure how the brown davis bars go as far as the CAMS regs go but I have seen guys racing with half cages installed. I have a mod plate on the car for the cage, seat and harness and it's all still 100% street legal.
I recently drove my car to and from the track and I know of others that do it here in QLD. As I said there will always be a bit of a compromise but you don't need to have the fastest, full on \"race car\" to get involved and have a lot of fun. My car is completely stock as far as drivetrain and engine go and yes I'm down the back, but with a few little engine mods I'll be mixing it up with the 1600 \"race\" cars and some of the slower 1800s.
Apart from the initial outlay it won't really cost much more than the sprints depending on what type of events you choose to do. We are lucky here in QLD to have a great series of affordable racing at QR run under the AASA banner. I've said previously if you guys in NSW could get the management at Wakefield to do something similar I believe club racing would boom.
In the meantime you have the prodsports events and the FOSC events to consider which are still reasonable value. Maybe some of the other NSW guys can fill you in a bit more about the details of these events. Check out their websites:
http://www.prodsports.com.au/http://www.fosc.com.au/Paul.