To mod it or not?

[FordFan86]

I'm having trouble deciding wether or not to play around with my car a bit and mod it. I drive a 5litre NC Ghia, my first car and i love it, drive it everyday, 207k on it and in great shape (apart from a few little niggly things, the biggest problem being engine mounts). I'd like to get more power out of it but the issues i'm faced with are a) fuel isn't getting any cheaper. b) you can only go the posted speed limit c) the car isn't getting any younger and lastly it's money that probably won't be seen again.
I love my car, everytime i look at it i think damn that's a sexy beast, i wouldn't mind upgrading to an EL or an Au of some sort... or i could dream for a BA, but i have to be realistic about costs involved.
Right now im working plenty of hours and managing to save a bit of money each week, but i start uni next year and would also like to get a bike licence and have a few weeks holidays in NZ.
I'm just after your opinions as car nuts aswell of those of you who have been there done that and have family now...
thanks
-James