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You're welcome!
Hope things work out well for you and you find a camera you enjoy shooting.I guess making a smart decision on what to get (and saving up for it) is worth it -
frankly you are going to burn money with medium format (film / dev / scan) anyway..
..so might as well shoot with a proper camera - one that gives you results so satisfactory the whole undertaking is worthwhile
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Medium format SLRs are really not ideal for shooting portrait-oriented.
So if this is what the camera will be used for predominantly I'd get something more suited - and a GA645 indeed is (I'd prefer the regular version).
You can get them for €500 in nice condition - which is, frankly, not a lot of money for a proper medium format camera with a great lens.
Of course you can go cheaper / "less great", but then maybe it'd be just smarter to just get a nice portrait lens for whatever 35mm camera you have.