I've a 80GB Seagate baracuda SATA II.Will it be better if i buy another 80GB HDD or get my present HDD xchanged 4 a 160GB.My mobo supports Raid 1,raid 0,raid 0+1,raid 5 and JBOD.Does installing 2 HDDs improve performance?Plz reply within half an hour as i've buy d HDD.