I am into scooters....
you can fully modify an older vespa scooter with new pistons/cylinder/larger carbs,exhuast etc... for under $1K
parts and labor
lambrettas can get very expensive, especially the SX or TV models
if older vespas is what he wants go for the P200E very relaible...
The newer ones are automatic, fast ..... but pricey...
my vespas
they do race them too.... GTS250 pictured below