supertechs as i mentioned on UKwhat.
check my build thread on here for details.
Phil
What he said.
I've also earmarked an ebay listing that I thought about trying a while back just for badness:
http://www.ebay.co.uk/itm/291236612157?_trksid=p2060778.m1438.l2649&ssPageName=STRK:MEBIDX:IT
Dunno what quality they are as I've yet to need a set.
The Zisco ones work out cheaper than stock too.
Jay