I would start out with this set:

http://www.capricornrc.com/os_capric...79&language=en

This combined with replacing all the steel pivot balls to aluminium ones will get you close to the 60-80 grams you are looking for.
If there is still budget left I would suggest replacing all the screws except the ones in the chassisplate for Ti ones.

If you want to save weight work in the following order:

1) Everything from the driveline and suspension, driveline gives you more acceleration, suspension more overall traction.
2) Get all the weight out of the highest points of the car, for instance the bodyshell. Most weigh around 120 grams, mine weighs in at 98 grams.
3) Outside to inside, getting rid of weight outside the wheelbase of the car will help it rotate better. Again the bodyshell or front bumper.

As you can see I would never advice someone with starting to save weight by switching to Lipo or Life. This will actually worsen performance.
If you want to switch to Lipo or Life get the brass plate as well, now you will lower the CG thus increasing corner speed.