Preacher and the prospector are by Artizan Designs; the saloon girl is in fact a Victorian street walker from West Wind's Gothic War range (Jack the Ripper series I think); the sheriff is by Black Scorpion.
There a bit of scale creeping going on there, as BS stuff weighs in at about 32mm, while Artizan and West Wind are more like 28mm. Dixon, by comparison, are more like 25mm. I think that, by and large, I am going to stick with Artizan and Crusader, which seem to go together very well, and possibly get some of the excellent Wargames Foundry stuff, which I know will scale well together. Dixon minis can fill in gaps in my range, as they are cheap, if a little bit too small. BS will do for the odd character too, after all, some people are tall, and others short, so long as I don't over do it.
Here's Cookie and Old Digger Johnson, posing next to a camp fire, and helping to illustrate the scale differences between Dixon and Artizan. Cookie and the fire are both by Dixon.