I used to build my systems but bought the last one because I just couldn't have been bothered. It's a Compaq SR1710NX. Some pre-built systems use low-quality parts and others use decent stuff. I was sold on this one because it's uses an ASUS S939 board w/ ATI Xpress 200 Chipset, AMD Sempron 3400+, four DIMM slots that will support dual-channel mode, open PCI-Express x16 for video, 100GB SATA, CD-RW/DVD-ROM, free SATA connector, free IDE connector, 1 x FireWire. The cost was $400CDN and it's licenced for XP. I bumped up the memory, added a 485W PSU and Sapphire X1600XT (GDDR3 model). The machine runs quite nicely for my needs and, according to HP's specs on the board, will take an A64 or X2... something for down the road once I get around to building something nice.