I knew that last option would be too tempting for you people.
I can't make up my mind between voting for the Holga or the 28mm. Or the rangefinder. The 20 rolls of rebranded APX 400 sitting next to me make that a slightly less compelling option, though you can never have too much I guess. The Holga would require either a bigger tank for the 120 film or a 35mm adapter, which does produce pretty cool results.