Hi!
I received my hr05 sli some days ago from jabtech (currently couldnt find it in UK) and it cost around £18.
it lowered my northbridge temps from 47C (with vantec iceberq) to 32-35C without any airflow around the heatsink.
it is an absolutely amazing cooler, just wont fit perfectly with big hsf's due to the lack of space on this board, but i managed to fit in an xp90c/7800GT easily.
you must buy one if your heatsink is heating up your whole case - it has dropped my cpu temps by 2C also.
i would definately recommend it - hopefully someone around the uk willl also stock it soon.