cant beleive Ive done it but Ive just ordered a newer, higher spec Motherboard with full onboard RAID.
Its like going back in time 5years when I used to spend all my wages on a Graphics card or somthing
anyway see if that gets me the performance Im expecting, should be about 400mb/s read and 250mb/s write.
edit: gone for one of these.
http://uk.asus.com/product.aspx?P_ID=esOE5RDJVEmQI86w