I am building my first sli computer.. I am wondering if there is going to be a space problem with my vid cards if I get two 7900gtx... the cards seem huge i just don't want to get it all here and it not fit.. the choice of mobos is msi k8n diamond plus or asus a8n32 ....will it work the case is a Thermaltake XASER, Armor Series.. what do you guys think???