Just my two cents: By the bike that fits you, your goals and your price range. Don't worry about where it's from. I know lots of people feel uncomfortable doing this, but you do not have to have it serviced at the same place you bought it from. While I do think it's great to have loyalty to a shop, I don't think that means you need to limit yourself to the bikes they sell. If a shop doesn't get that, then they arguably don't deserve my loyalty. They make more on service than the purchase of the bike anyway.

FWIW, I think Jamis makes some great bikes, especially for their price point. Plus, I like steel, especially when compared to lower end aluminum bikes.