I think I might spend some tax refund money on a Folding Farm in a box. Here is the parts I'm thinking of using: 4x 9800GX2(I hope to get a decent deal on these used, otherwise I might go for 2x GTX295's and add 2 more once they are cheap) MSI K9A2 Platinum Phenom 9600 2.3GHz Quad-Core 2x2GB DDR2-800 80GB SATA Hard Drive 600w OCZ StealthXStream+ThermalTake PowerExpress 650w(I already have this, and it is a dedicated PSU for the graphics cards) ThermalTake Armor+ What do you think? I'm wondering if I can drop the CPU down to something even cheaper. I doubt I'll be running the SMP client on this, just the GPUs, so would a dual core be able to handle it? Of course Vista x64 will be used so that the GPU client doesn't kill the CPU. I did a quick build on newegg, and it comes to a little over $1600 for everything, but I'm hoping to find a lot of it used, and I'll definitely be shopping around, especially the video cards. They were $260 on newegg, I'm hoping to find them for $200 or less.