You don't need a 4x5 enlarger. You can contact print so any dichro head enlarger will do. I got mine for $80 shipped to my door off ebay but the running rates are more like $120. You'll also want a Kodak 5liter E6 kit and some method of processing 4x5 sheets.
Yes, I already have the at-home E-6 processing under control. I'll look into the enlarger. Oh, and finding someplace to put a darkroom! Till now, I have survived with changing bags and, dare I say it, hybrid workflow.
I sent some scans to dr5 for printing onto slide film. I'm interested to see how the results compare with the original.