232 is the right build if you want a "safe" taste of ICS. Worse case you can FXZ back to 905 with a minty factory fresh feeling. I implore you to read and understand the OP FULLY before embarking on this ride. Since you're on 905 stock, you could skip step 2 and 3 in the INSTALL 232 option. Use option 1 to push the update to your phone. Option 4 will walk you through flashing it in recovery. Option 5 will optionally root it for you if you desire.
(NOTE TO ALL....the *ONLY* time you will see me tell someone to skip step 2 and 3 is *IF THEY ARE STOCK 905*)