what's wrong with the rc2 that you think it's unstable just wondering?
First let it apply the update via RM notification, selected all the options including new Gapps... when it rebooted I was still Themed and still on RC1.
So I downloaded it directly from site..
Booted into recovery, wiped data/reset.
Installed RC2 and Gapps.. when it booted up this time I was on stock RC2.
Let it redownload Market apps and left it alone for 30 minutes.
Then when i started looking at new features everyone of the buttons for the new stuff in CM settings area casued a spontaneous reboot.
OK, so I decided to leave them alone..opened up Market to check to be sure I had all my appd..when I hit the Downloaded button (menu>downloads) another spontaneous reboot... thought OK, did a battery pull and let it reboot again... after everything stabilized ( I never even unlock pone until SDcard is finished mounting).. I went back to the Market to check my apps again. Started to download one that I needed....spontaneous reboot again...
Decided I had better things to do on such a nice Saturday, rebooted into recovery and reloaded my RC1 backup.
As I said elsewhere I may try again later, but usually when I load a new ROM and it is not perfect I don't waste my time Theming it... I prefer to wait until it is as solid as stock before putting the time into Theming it.
Ironically RC1 has been perfect for me and is currently my ROM of choice.