I've never been a fan of the light weight alloy handguns, never had one, but have handled and fired. Just feels like 'nothing there'. Much preferred for a smaller revolver my Mod 60 Smith 38, just not long ago got ahold of a Colt Detective Special, the model with the ejector shroud, top shape, good price. Never cared for the older models with the ejector unprotected. Should have gotten and always wanted one the years I wore a badge, but the $$ always needed elsewhere. Back then they ran around $130-150, had to pay more now. Not a big fan of the shrouded hammers due to looks, but they sure are better to prevent hammer snags, although I never had much of a problem with that. Just like all steel and don't mind the extra weight, which does help in recoil control. Have fired both styles (steel and alloy) side by side and can tell the difference.
Always liked the Bianchi 9R you mentioned Professor, thought several times about getting one for my Smith 60, but besides several belt holsters and a IWB, I always used a Bianchi X-15 for my 60. Liked that model, had a X-15 for my 4" Colt Trooper and a 6" that doubled for a Python and several other long barrel revolvers. I liked Bianchi back a lot better when John Bianchi owned it, before it was sold to Safari Land. A lot of the Bianchi labeled holsters now say 'Made in Mexico'., believe the older Bianchi products were better quality. The X-15 was always a well made and shooter friendly shoulder holster. I payed less for the four (another 4" I picked up used at a flea market) than a new single one costs now. If you buy a new harness for a X-15 now, they cost more than the whole rig cost back in the day.
I don't care for IWB in a rear (back) position, to uncomfortable sitting and PIA drawing IMO or on the side. Always carry IWB left side cross draw or mostly right side appendix, which I have no problem with. Pay attention in drawing and reholster and your vitals are secure. I even carry a Colt Officers Model 3.5" Double Eagle 45 acp in this manner with no problem. Smith 9mm Shield also using the Remora holsters I mentioned in my other post on this thread. Don't mind outside side carry if I have a loose jacket on, but even a untucked shirt doesn't conceal a side carry very well and its a pain while driving with seat belt on, both drawing if need be and just getting it positioned right.
Tuolumne Lawman you mentioned the Milt Sparks line. Very good stuff, have seen a few used ones at gun shows and knew a officer back in the day that carried a 45 Colt Commander in one. Its the old Bruce Nelson line/design that Bruce gave his blessings to Milt to produce. They were 'the thing' back in the late 70's through the 80's plus. Was always thinking about getting one back in the law years, switching to a Colt 1911, but never did. I was just looking at Milts website recently at the 'Summer Special'. Might call them and see if my Double Eagle which is based on the 1911 frame would fit ok. Might have to cough up the funds, but funds well spent. I leave my house, I carry, never know when needed with all the 'crap' and 'airheads' in society today. Never know when need to protect myself, family, others, or some officer may need assistance. No good to leave at home or in vehicle and wish later I had carried. The signs that say no weapons allowed in businesses, well to bad, the slime that have no respect for life don't care to obey, even where and when the 'do gooders' of our day say "Thou Shalt Not"!