Best place for this thread was Member Introductions. So i moved it there for you
Glad you are enjoying it. They are a great car!
As for the stereo. Your best bet would be getting something aftermarket installed. If you still wanted to keep the "standard" look, there are a heap of stereos that are built for the AH astra that just plug straight in. Do a search on ebay for VXMMI, Zenec, or Eonon.
And welcome to OA!