Axhi is correct. If your not manually typing -v on startup then its in your com.apple.Boot.plist.

Its located in: /Library/Preferences/SystemConfiguration/

The syntax goes something like this:
<key>Kernel Flags</key>
<string>-v -f maxmem=2048</string>

You just remove the -v and you will get the graphic startup. Id leave it be until you completely satisfied with your install as it does show useful information not only during startup but also on shutdown.

The other flags you see are just to show you the syntax. There is a single space between flags. If your not using any flags then it should look like this.
<key>Kernel Flags</key>
<string></string>

I generally copy com.apple.Boot.plist to the desktop. Make the changes then drag it back over. It will ask you to authenticate.

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