Here is how I would spend your money if I lived near you and I was tasked with buying pinball machines I wanted to play at your house while I come over to drink your beer.
Frontier $2800 ish
Skateball $3000 ish
Future Spa $1750 ish
Hokus Pokus $850 ish
Road Kings $1750 ish
Sorcerer $1850 ish
Total $12,000 ish
Cheers