Just DL Mavs now from the App Store and quit the installer when it launches. Then use
this utility along with an 8GB USB key to make an Mavs installer. Then option key boot to the USB key and you will get this screen.
From there launch Disk Utility and in the erase tab erase the new SSD to Mac OS Extended (Journaled). Then quit Disk Util and click install OS X and wait for install to finish.
Once that is done setup your account on the new machine and go to the Startup Disk pane in System Prefs and select the new SSD as the boot drive.
Now manually resinstall all your apps then manually move all your data over from a backup drive.
This will give you a clean install of Mavs.
That said, if you are not having trouble with your current install, this is a lot of work for very little if any benefit. I would install Mavs now then clone the old disk to the new and be done with it.