This sounds reasonable, but wouldn't I look like another "idea guy" if I keep bouncing off a list of different ideas to other entrepreneurs or VCs?

Wouldn't they would like to see me being passionate about one market, one idea, have detailed research about it, being committed about it?

It's very easy to bounce of bunch off ideas with VCs or entrepreneurs - if they are your friends. But it doesn't seem to be very logical approach for first time entrepreneurs.