If you want the ICS launcher on the Eris, CondemnedSoul's is the one - it's the default on the ROM. I personally don't like it - the app tray looks horrific, IMHO, on the Eris - but that's the way that I would go.
Yes, full wipe would be required.
Spend a few bucks on TitaniumBackup, have it backup all user apps in GSB now, and when you flash CondemnedSoul use Titanium's batch mode to restore all missing user apps. It brings back data, settings, etc. You'll just need to go through and set up the launcher and the global settings again.
Oh, and flash xtrCache2cache as well. http://forum.xda-developers.com/showthread.php?t=924562
Yes, full wipe would be required.
Spend a few bucks on TitaniumBackup, have it backup all user apps in GSB now, and when you flash CondemnedSoul use Titanium's batch mode to restore all missing user apps. It brings back data, settings, etc. You'll just need to go through and set up the launcher and the global settings again.
Oh, and flash xtrCache2cache as well. http://forum.xda-developers.com/showthread.php?t=924562
