Worth and or Value are relative to your own personal taste! You said a few key words... FUN and LOVE! As long as you keep those two words in perspective you can then place a value or worth to your goal!
Bottom line is the GP's are a pretty easy engine/car to work on, mod and tinker. Petty much everything that could be done to them has been tried already, making this forum a wealth of info., should you attempt to try something. Start with the safely modding your 3800 thread and go from there. Read a bunch before you decide what you want to do and then make a plan. Read again and assemble all your parts for your project, then get ready to have some fun. For a grand, there's lots you can do. Just make sure that you build that rainy day fund as well as the car is over a decade old and things will break, wear out or just plain need replacing. For a twelve year old car though, weighing two tons, getting almost 30 mpg(hwy when tuned) and having some decent pull... It's a worthy investment IMO.
Enjoy!
: )
