Well, that was a brave move! The C330F is a fine camera but large, complex and has superb lenses available. I see in another thread you're already doing 35mm but you don't say what style of photograph you prefer to make so it's a little hard to advise. Since you've already bought the Mamiya I'd say to stick with it, use it, see how comfortable you are with it and then after some time make a decision about whether or not you want to change.
It will be a decision based on convenience - not on image quality!
Mamiya TLR - large, bulky, great interchangeable lenses.
Rolleiflex TLR or similar - less bulk, fixed lens, quiet.
Hasselblad - great design, can be high maintenance, heavy (especially with tele or wide lens options) noisy shutter/mirror.
Fuji and other RF's - light, some fixed, some interchangeable models, some prone to breakage. Some different formats available - not just 6x6.
Older folding 120 cameras too, but condition and lens quality might be an issue.
Above all, make sure you first handle and try anything you're thinking of buying.