A Luger in .45 ACP, yep one of those million dollar guns.
There was a guy who made replicas of those; they're a *bit* cheaper than the original ones... I think someone else built some in .45 too, but I don't remember who offhand.
As far as a "dream autoloader"... I want something designed from the ground up for concealed carry. It should be plastic and stainless steel, and rounded like an old bar of soap, with no corners, levers, external hammers, or other projections. A couple of square notches milled into the top for sights would be fine. I want an absolute minimum of openings to admit pocket lint, Cheeto crumbs, sweat, or rain. I'd look favorably on some kind of sliding gaskets or labyrinth seals on the moving parts, and maybe an O-ring seal on the magazine. It should come apart easily, preferably without tools, for cleaning.
I carry all the time, and my carry guns deal with sawdust, grass clippings, blown dirt, grinder dust, paint overspray, gallons of sweat, occasional rain, and getting banged into things. Holster wear and sweat ate the finish off long ago, and I'm starting to see enough pitting to know that at some point the guns will no longer be safe to shoot. Even daily cleaning can't keep the corrosion at bay, and the sharp edges not concealed by the holster wear holes in my shirts.
It's one thing to move from an air-conditioned house to an air-conditioned car, then dart across a shaded parking deck to the air-conditioned elevator to your air-conditioned office. In an outdoor environment in the South, things are *much* less friendly to carry guns.
I don't want a fine 1911 or Hi Power for carry. I want a soulless McGun that's reliable enough to depend on, is convenient to carry under my conditions, and cheap enough that when it has a problem I can just throw it away and get another, like any kitchen appliance.
There's a whole industry of "concealed carry pistols" now, massive double-stack monsters with spikes and levers all over them, about as "concealed carry" as the last "portable TV" we bought, which had a 27" CRT, weighed close to a hundred pounds, and was "portable" only be virtue of a recess molded into the top that was a kindasorta carry handle, and flexed the top alarmingly if you actually trieed to pick the TV up with it.