I think Truck Stop Women and Devil Times Five look worthwhile. I heard good things about Devil Times Five and I like Roger Corman drive in movies. Black Gestapo is most likely shit but I will probably get it out of interest.
The Fred Williamson movies are pretty low rent, Mean Johnny Barrows is the better of the 2. Death Journey is pretty bad IMO. Id watch Mean Johnny first and decide on the other. Most likely youll not bother

The Forest from what ive heard is a below average horror, a "barrel-scraper", so Bill's specialism really.
And I already got Police Connection and Weekend Murders. They are not worth upgrading from the DVD as they are not significantly better.