What's the maximum post length?
The short version, i.e. within the realm of reality for me...
S&W 640 no-dash (came close a few times, but alas, no luck

)
S&W 649 DAO
Ruger SP101 (esp. the DAO 2.25" .357 Magnum...if only the Wiley Clapp model were available in DAO it'd be pretty close to perfect)
S&W 2" 12-4 RB (ok...maybe this one's not as much of a possibility as the others)
Colt Detective Special
Sig P239 DAK (someday! someday!)
Ruger LCP (may be my next gun, assuming I can save up some $$ without the sky falling again)
.357 Magnum lever-action rifle
AR15 (I think a 9mm version would suit me quite well)
HD shotgun (I've shot a 870, but I'm leaning towards a semi-auto for this role)
Coach gun (short-barrel SxS shotgun)
Maybe a little outside the realm of reality, but I always wanted to get at least one of each variation of the NY1 NYPD revolvers.