I second and third everything said! one other usefull bit of kit for working with XDCAM HD is the Matrox MXO, which enables critical monitoring of your HD sequence direct to a qualified LCD display (ACD 23″, Dell 20″/24″ etc) and also provides an HD SDI output or SD SDI downconvert … and not least of all, allows you to output without the length conform process.
hope it helps
Andy