A heavy bullet at low velocity is what does the job as old Elmer used to say

anyways I'd probably go towards something like one of those brazilian contract guns, the smith 1917 as they seem to be fairly priced:

S&W Model 1917 45acp WWI Revolver - YouTube


not sure if there are any others besides the obivious model 25, although I think they did make a 55' N frame in .45 acp that was refered to as a target gun but I dont think that would be ideal for concealed carry.

also I came across this a little while back with a schofield and towads the end of the video he shows a neat little speedloader for the moonclips that might be of interest to you:

TK Custom Precision-Machined Revolver Moon Clip Conversions - Gunblast.com - YouTube