I guess i will just confirm what everyone  else said. And being a 50th anniversary owner i will say that it is a great car. I enjoy it quite a lot. However , if i couldn`t afford both, it would be the first to go. If you can buy a C5 enjoy and fix the `78 as you can. I will say it is not cheap to maintain the `03. there isn`t much you can do on the car yourself and it is full of electronics. Tux got the #`s pretty good, I could do alot to my `69 with an extra $7-8 hundred a month. if you like the oohs and ahhhs keep the `78. if your not into constant tinkering and repair and want piece of mind but the `03. However, make sure you purchase an extended warranty you Will  use it. Add another 2K to the buying price.

Keep the 78!  What kind of comments did you expect when asking this distinguished group of Corvette professionals?