We have an Agilent 1200 LC/6410B QQQ with MassHunter 4.01 SP3. Our computer--(HP xw4600 workstation 2008, 32bit XP) is showing signs of age, and we're considering buying a replacement. We are NOT very savvy regarding computer components--trying to learn. Agilent's quote for a replacement PC is ridiculous...looks $2K higher than what I might get from HP direct. Anybody have any experience/advice replacing PCs on these systems?