I have the same bike (well diamond framed) as your Grand Prix and deemed it handsome enough to get alloy wheels swapped on for the steel rimed ones and it is in line for a complete rebuild. I think the Raleigh cranks look really sharp and the Suntour ratcheting down tube shifters are nice.

If you go with upright/north road/cruiser bars, why not get a cheap set of friction thumb shifters rather than the 'pricey' bar end shifters? Clean up the drive train parts -- I bet there is a lot of life left in them.