IMO, option 3, exception would be an inexpensive folder like a Kodak Tourist II(6x9) or other 620 size film camera that can be modified to accept 120 film. These can be had for well under $200, most under $100. Agfas in good condition are a bargain, and most take 120 film. Case 5 is a good option, 4x5 monorails can be had for low bucks, Calumet CC-400 series can be had for less than $100, then add lens, film holders, tripod, etc, entire kit within your budget. Either way, a decent incident light meter will be needed, still staying under budget.