I've had similar thoughts with my 91 Diablo.

I have put on a set of chrome OZ alloys as per SV, 17 fnt 18 rear, hasnt made the ride any worse, I keep the original rims and planning to use them for track days.

I don't like the look of the open headlamps, and as this is not a reversible change, recommend that you don't do this. Its a bit like tacking on a murci front end to the 6.0 , just wrong, in my opinion.

I've been thinking about adding a low rear wing in show carbon fibre, and perhaps carbon fibre around the rear lights and vent that is between them. This is reversible, won't detract from the value of the car.

Don't expect to add value to the car by making mods, just make sure that you don't take value away.

Brake upgrade would be really appropriate for the car.
When I get in one of my other cars after driving the Lambo, first press on the 'chicken pedal' nearly puts me thru the windscreen.