I currently have a belkin wireless g MIMO and want to replace with N1 vision. Will all the set up be lost (password) when I switch to N1 vision. Can I just plug the new one and ready to go? Thanks

Yes, all the setting and password, WEP encryption password, etc WILL BE LOST. Well they are not actually lost, they remain on the old router until you delete them or reset the router to the factory default.
I think what you are really looking for is will the setting and passwords transfer automatically(NO)
So you need to write down the old setting and password if you want to keep them and put them into the new router during set-up.
Unless you are going to personally keep the old router, for security, reset it to clear out the passwords.The reset procedures is the same for both routers
Just in case you do not have the new owners manual here is the direct link to Belkins.
http://cache-www.belkin.com/support/dl/p75490_f5d8232-4_man.pdf
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Hello,

The short answer is YES, your settings and password will be gone.

If you haven't done any custom setting changes on the MIMO router then you probably won't need to do much configuring on the new N1 router besides the initial setup.

I hope this helps in your decision.

Best of luck!!

I assume you are referring to the wifi password.
The wifi password and any other settings are stored on the router itself. If you replace your router, the settings will be lost.