currently have the fans which came with the case and a NH-U14S, just wanted to ask what size fans other members have upgraded to. i want to stay with noctua and thinking of going 120mm so that they will just slot straight in. i think there is only three fan slots on the mobo which is z87-d3hp, so do i need to buy some sort of expandable block to cater for extra fans if i buy say three?