I was pretty shocked when i saw the picture you started the thread with, I just finished one of these last month.
It actually felt really well when i took it out for a spin, shifting was super smooth, handled really well, i would actually keep it for myself if i didn't have 4 bikes already, thats how nice it was, it was very surprising for a massed produced bike like that, i didn't think it could ever feel that good, i'm not sure if it's a grand prix though, but the lugwork on it was exceptionally nice, plus the raleigh decal was really awesome too!!
When i got it it was a mess, covered in mud, and seemed to have bicycle-neglectus-syndrome (BNS) i cleaned it up, took everything apart, regreased hubs and bb, new cables and wraps, new beige wall tires, new chain, new housing and a good clean up and here's the finished product:
i sold it last month, and the person who got it was extremely great full to be able to buy the bike, i had alot of people reply to the ad but this guy got to it first. He sent me an email about 2 weeks later to tell me how awesome the bike was, i'm glad to see that the bike went to someone that will truely appreciate it. It makes the sale even better