[Willie Green]

I have about $40,000 to spend. I need something that I can drive clients around in, yet hopefully is fun to drive, reliable, and that my estemeed colleagues will not view with disdain. I am not opposed to buying a used car,

Well this site lists 5~6 used Excaliburs for sale.
They're all within your price range, but I kinda like one of the '84 models:

I doubt if anybody would scoff at this!!!

[Spktyr]

Everyone would scoff at that. That's a pimpmobile by today's tastes.