I really like the Pietta Great Western II that EMF sells........they are 99.99 percent Colt interchangable and the fit and finish is superb.
If it's your first one Go for 45 Colt (38 is for wimps
) it's the easiest to reload, find ammo for, etc. and I like the 7&1/2 inch but some like the 4&3/4" saying it's faster outta the holster. Longer sight radius = better groups..........Or go 5&1/2 inch as a compromise, that's what the Army did and called them "Artillery" models!