Thanks for all the suggestions! I'll have to do a bit more research into the Minolta. Unfortunately, the Olympus looks a bit out of my price range.
Right now it looks like I'll go for the Zeiss, as it's not much larger than the Oly, takes 55mm filters and is a bit cheaper/easier to find than the Minolta.
@mike reid Gotcha. Sounds pretty similar to what I'm trying to do, though my results aren't quite there yet. I feel like the colors on mine tend to come out over-saturated, where yours are much more realistic.