Welcome everyone

I use now nikon d90 and nikon f5 film camera

And I want to buy a MF camera

But I'm very confused

I have found several models

Such as pentax 6*7

But the price a little high

and I have found mamiya m645 and mamiya 645 af

the mamiya m645 very cheep i found it for 300 us dollar and lens very cheap also

and the mamiya 645 af i found it for 700-800 us dollar

the mamiya 645 af Exposure Metering only Center-weighted and Spot , without Matrix Metering , Is it important? for landscape and portrait? and what about the m645 ..?

Thanks to all