I bought a used Rolleiflex 3.5 F about 20 years ago for around $ 700. It has the Planar lens and has a working meter. Therefore, you could probably get a Rolleiflex with a Schneider Xenotar and non working meter for less than my type. The Xenotar is supposedly just as good as the Planar. Also, since I use a hand held meter I really didn't need a working meter on the camera.
If you want to go interchangeable lenses, the Mamiya 6's and 7's are supposedly very, very good. The price may be a little higher, though.
Fuji also made some good MF cameras also as the 645 and I think also a 6x6.