It's the new bike we want to see! Though if you aren't finding anything about your rides that you want to change, then maybe that bike is good enough. If you ride rolling terrain, you'll be able to do it longer on a new bike that is probably going to be more than 10 pounds lighter.
The Grand Prix's were what I consider Raleigh's look's like a race bike line and weighs in around 27 pounds by the catalog. They were heavier than other models that were made to be lightweight road bikes. Though my 1978 Raleigh Competition G.S. was still 23 pounds. Better wheels and more expensive new Shimano Ultegra group and I might have gotten it to 20 lbs or a tad under. At just 17.5 pounds, I'm very happy with my current Specialized Tarmac. Many hills I no longer notice.