We have a mixture. My 1.5yo does enjoy a flashy noisemaker, but I don't think you need tons of them as they basically all do the same thing. His favourite at the moment are a phone that plays lots of songs and a ball that rolls by itself and has buttons on.
The toys he plays with most are the open ended ones - cars, balls, stacking rings, blocks.
Most long lasting things have been role play toys - toy kitchen and accessories, tool kit, doctor's kit. And toy cars/trains with the wooden track, figurines (animals, dinos) - you wouldn't need to go out and buy all of these tomorrow, but I would consider them the next time you buy toys.
The nice thing is all can be added to over time, so you could start with a simple circular train track and single train, or even just start with wooden cars/trains designed for that type of track, then upgrade it with more track, splitters, tunnels, bridges, electric trains etc.
For the other toys start with some kitchen accessories, later add play food, add the actual toy kitchen later, upgrade the accessories/food, etc.