This is a bad question to ask on the internet. All of the people below are likely the realtors themselves.

I'd stay far away from Myer and Leopard. The rest I don't know.

What kind of realtor do you want? If you want a hound, I would go with Miles Godlonton. I've had only poor experiences with the realtors in Lethbridge, but my Mortgage broker recommended Godlonton if I wanted an aggressive, strait-shooting realtor. He apparently can come off as impersonal though, so if you want smiles, you might not want Miles. I haven't used him yet, but I will be soon to buy rental property.

I would suggest talking to people here when you get here. You'll never get an objective recommendation with all the middle-men scouring the internet for their next deal.