Upgrading to a SSD, any possible issues with the OS X upgrade? So I had thought that my AppleCare lasted until September, so today I visited the Geniuses to try to squeeze a new hard drive out of them. Unfortunately, my warranty ended a couple weeks ago, and so I am shopping for a new SSD instead. 

Newegg has some great deals, and it looks like I will be getting off pretty easily price-wise. My one question is, however, how does changing out my hard drive (myself theoretically) change the Mountain Lion upgrade issue? Are there any involved problems with a new drive and upgrading?
Nope. While you've got to re-install the OS, now would be a great time to just do a clean install and use Migration Assistant from the old hard drive, using it as a pre-install "backup".