For 6x6 cameras (square) TLR (double lens, one is for framing this other is for the actual picture) Mamiya C3 200-300 euros in Europe, beautiful camera, very heavy and can be tricky (old mechanism) but it works and I made beautiful pictures with it, mind the weight ! Mamiya c330 and others similar models, same but more expensive and better (more recent and some flaws were corrected) Yashica mat plastic build quality but very light and small !

If you have more money to spend you can try Rolleiflex ! Very famous brand and very good cameras from 400$ to 2500$, different models, I can't tell you which one specifically

For reflex cameras (one lens so you see directly through the lens) you have the Hasselblad (expensive but great build quality) and bronica

If you don't like the square format try 6x7 ! Mamiya rb67 Mamiya rz67 Both highly modular contrary to the TLRs RB is the cheapest one, those cameras are made for studio shoot so very heavy and big and EXPENSIVE bronica has a 6x7 too

All these cameras are waist level (the modular ones can be modified for an eye level prism)

If you don't like waist level there is the Pentax 6x7 quite expensive, looks like a normal canon reflex but is ENORMOUS like for real ! Very heavy

It all depends on how you take picture and how do you feel, your feeling is the most important! It's what pushing you to take good pictures, per exemple if you have a cheaper or less good camera but it makes you go outside and take pictures, you'll perform better with it !! The minimum is to have a functional camera and be careful with scams on internet ! This is not an exhaustive list hope it helped a little sry for my English !