You will not go wrong with a good Jalpa. They will be escalating in value as those that grew up having posters of these cars on their walls, will be able to afford them.
They also have much more "lamboness" and character than their newer models.
The roof is heavier than a ferrari 308 roof, but I remove mine myself constantly.
These cars appear to be more sought after in Europe than North America.
They seem to be worth 30-40 U.S.

My car has Ansa sport exhaust and great 17 inch wheels, (the originals, I use as a coffee table).
Maintenance is respectable, especially because they have chain driven cams vs belts which have a much longer service ratio.
The car with or without upgraded exhaust sounds fantastic!

The upgrades Raymond has would be good but not necassary for sporadic use.
I have done neither to mine. Raymond makes good recommedations though.

Send some shots if you have some and we may be able to tell you what is right or wrong with the car.

Good luck

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Had Enzo been a gentleman...The greatest cars on the planet would have never existed.

Jalpa FLA12194
Countach ELA12667
Countach KLA12002