XDA user WestCrip does it again! One of the best ICS ROMs out when ICS was first available was without a doubt the Resurrection Remix ICS ROM (v.9.6 I think). Well starting with PRO version 1.2, the Resurrection Remix PRO ICS ROM comes with Android 4.0.4 and AOKP features like ROM Control (which I love using on my other phones with AOKP ROMs), allowing you to control every bit of your UI and even overclock to stable 1.6Ghz.
Anyways, you have to try the version 1.2 (and version 1.3 is being uploaded as we speak) and let me know how it works for you!
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For all Galaxy S2 GT-i9100, please see Galaxy S2 FAQ here for all rooting, backup, install guides.