OK, I'll bite.
My current dream revolver would be a S&W Model 460V 5", Model 460XVR (8.38"), or the Model 460XVR Bone Collector (7.5"). My preferences change almost hourly between them, but right now I am favoring the 8.38" version.
The dream part would then be to send the cylinder assembly to TK Customs and get it cut for .45 ACP. I just love the idea of a .45 ACP revolver that can shoot up to magnum levels. I would probably just mostly shoot .45 ACP; the idea of a beefy, long .45 ACP revolver ported and cut for moonclips just excites me. I bet .45 ACP out of one of those beasts would be soft as butterfly kisses. I'd probably work my way up to .460 slowly, but I've heard it's not bad out of the bigger models.
The other part of that build that excites me is like someone else's cut for .45 ACP .454 Ruger Super Alaskan Redhawk, you could just put a huge variety of rounds through the gun, if you wanted to. (I forget who posted that gun, but it was inspiring--thank you; shout out to the coolness of TFL community.)
It'd fit with my moon-clip-only policy for revolvers, too, heh... that and it has porting.
Finally, I also want a snubbie 9mm... My dream 9mm snub would be S&W, stainless, 3", DAO, magnaported, action job/stoning, 5-shot, with either finger-grooveless checkered wood OR G-10 grips, and brass front. In reality, I'd settle for shorter snub with no mods or work on it and likely will.