My SO has a Trek 2100. A couple of years ago he put new wheels and components on it and is very happy with it.

I have a 1995 Cannondale. I spent a lot of money putting a carbon fork, upgrading it to a 9 sp. and I still wasn't happy with it. I bought an Aegis Swift and love it.

Try demoing newer frames 1st. then decide.

If you do decide to keep the frame start with the wheels. That is where you will take off the most weight. I took 2+lbs off
my mtn bike just by putting on new wheels. Plus, if you do change your mind, the wheels can be put on the new bike.