If ya like, I'll have my Vette at our club meeting tomorrow, Tuesday 5th Dec, Night. You can have a look at what type of system I have installed and how it fitted in. I have two 6x9's in the back at two 6" in the kick panels in the front. I didn't go for dash speakers as I had my top dash bad covered in leather and covered the old speaker holes.
Price will determine the starting point so you will need to think about how much ya wanna spend. From memory the head unit was only around $250 45w per channel JVC. Kenwood 6" around $200 and the Infinity 6x9's around $400. All prices are RRP. If ya huint around you can do better. As an example, I got the Infinity's for $300 on sale.
Hope this helps.
Cam