Well, after searching some related threads on this forum I see that wheel choice can be a rather touchy subject! I guess that's how it is with matters of personal expression...
For the record, I decided to return the 18" Draglites - the initial euphoria of big shiny new wheels on my Cutlass subsided, and despite their eye-catching flash they just don't fit the image I have for my restoration. Plus I'm cheap by nature, and my wallet just wasn't opening up for those things. But for a few days though, they were a kick to show off!
Thanks for the responses and recommendations - I'll be considering my options.