If you can still get back into clockwork, we're fine
Just go with LeeDroid to start off with. Head
here and the file you're looking for is called
LeeDrOiD HD V3.2.1 (FTP). If you want to wipe to EXT4, you'll need the file called
Optional FULL WIPE to EXT4 patch (FTP).
Download both, place them on the root of your SD Card. In clockwork, select "Install from Zip", then "Choose Zip" and select the EXT4 zip file. Once that's done what it needs to, head back to the main menu in CWM, then select "Install from Zip" again, "Choose Zip", then select the LeeDroid zip file. Again, let it do it's thing, then reboot from within clockwork and it should take you into your OS.
First boot may take a while, so don't panic if it takes up to 10 minutes.