As such, I'm on the hunt to find the most detailed HO rolling stock. I want cars with brake lines, cylinders, hardware... it's all in the details!
Blackstone Models make some exquisite models as a fine example:

Only trouble is, Blackstone are HOn3 and can be very pricey (sometimes over $100 for a single car!).
Foothill Model Works make great stuff for On3 and I found a company called P-B-L make great stuff for Sn3... but struggling to find the love for good ole' HO.
Any thoughts?
Thanks!