QFT :laughing But I don't think my case is the norm, and I have limited myself to one agency. I'm going on 5 years now, but I'm really close.
Good luck, but I seriously wouldn't limit myself to one agency. That particular agency might never hire you. Much better to give yourself more options. Sometimes one agency will pass someone up for no apparent good reason, maybe more than once, but you might be seen as the best thing to come along with a different agency.