Advice on starting a collection

I’ve always loved cars, and now I have grown up money to play with I want to start a collection of diecast models!

I’ve been in this sub for a while doing a bit of research, but was wondering if I could get opinions on what scale I should go for. Space isn’t an issue, all I’m looking for is excellent quality, loads of detail and generally just something I can enjoy looking at.

I’ve ruled out 1/64 as too small. I like the AutoArt 1/18. Another consideration would be I fancy displaying them in a diorama, 1/24 seems to be quite common.

Basically, any advice would be appreciated! Don’t want to start down the wrong scale and regret it!