Pete,
From what I've heard from the majority of C5 owners and read in the media....you're getting one hell of a car. There is one thing to remember though: you will always hear about the bad cases before you'll hear about the good cases.
I'm going to stick my neck out on a limb and say: it's not often you'll hear a happy Corvette owner post praises over and over about his or her Vette unless asked. However, when they have a problem with it, they will most definitely post about it and several people will reply and before you know it.....you've got several threads going on that can basically make a small molehill look like a mountain.
With that said, the C5 is not perfect. No automobile is. I don't own one....in fact, sad to admit, I've never even driven one, but again, based upon what I've heard, some model years have a few quirks over others.
The way I look at it, all Vettes....all cars have particular quirks. The C4 generation has an innate tendency to flex when their roof panels are removed. This is a quirk. It becomes a major problem if you're not willing to accept it and let it go. It's a slight bother at times if you can live with it but is outshadowed by the amount of overall enjoyment you get out of the car.
The chassis will flex in my '90 when I remove the roof panel. On cold mornings, the radio rattles in it's chassis (a known problem on older C4s).....the door sills are a little high and a pain in the butt to climb over in tight parking conditions. These are all quirks that I'm willing to live with because, when I climb behind that wheel, turn the key, and take off.....I can live with the rattle, the flex and the nuisance of climbing over the sills.
Enjoy your C5....in my own unprofessional opinion, I'm willing to bet, you'll love your C5 and you'll be very happy with it.