How To Choose the right sewing machine?

[Margherita]

Hello everyone I am starting a new adventure and I am making leather collars and leashes for dogs. I am currently sewing them by hand but I would like to invest in a good/resistant sewing machine. I am definitely not an expert and online I am find a lot of different opinions about this topic that are a little confusing.
What would you recommend buying for a first timer?
I am looking around on e-bay and similar websites and for my budget (500-600 CAD) I only seem to find Omega machines (to be precise model 307 or Walking foot WF24LNZZ).
Just to be completely transparent, I am planning to sew thickness of 3oz / 3.5oz natural leather and/or 3oz of natural leather plus a padding of 0.8/1oz soft leather and some foam.

Thank you so much for your help!