I'm a 35mm user looking to get into medium format, and hoping to get some feedback on possible options. I shoot mostly b&W, mostly people (portraits & other), and some city/rural scapes. I'd like a camera that can be handheld, in addition to tripod, but don't have a seller nearby where I can get a sense of size, weight, etc. My budget is up to $300 or so, and have been looking on eBay at Pentax 645, Bronica etrs, and a few others. Are these viable options, or any other suggestions? Thanks!