Another sign the economy is really good

I'm looking for a UI firm to redo the UI on my first product. Right now, it's pleasing and usable enough, but going forward with this and our other products, I'd like our products to have a unique, company-specific "personality" (most people would call this look and feel) . I call it personality because I want it to be a bit more pervasive and a lot less surface level than simple look and feel. But that's not the point of this post.

So far, I've written 4 firms.

One called me immediately. They totally and absolutely "got it." But, I need more bids before I just blindly go with the first group I talked to.
Another one wrote me back after 2 days and said they'd routed my RFI but they weren't sure if they really did that sort of work, but they'd let me know (doesn't sound promising does it).
Two others - not one peep. Seriously. Not one.

I find it somewhat amazing that companies won't follow up on leads. However, I know that at my last large company, they basically tossed all the leads that came from the web. But small companies... especially companies that deliver web-based products... wouldn't they be interested in talking to a new business prospect?

Apparently not.

Please send recommendations my way... The two that haven't responded are no longer contenders. I will not be ignored!