what is a good kit to isolate cellular RNA from human blood? - (Jul/25/2005 )

The blood is from some deceased patient, so it is very precious. I only want to use no more than 500ul blood. Can someone recommend some good kit to isolate RNA from the human blood?

Trizol LS Reagent is a more concentrated version of Trizol reagent, specifically meant to use with liquid samples, i am about to try it myself, my colleague has used it with succeed. You use 250µl per purification.
You can check it from the web, it is invitrogen's.

coco