I'm a hardcore hobbyist in the market for a Mac Pro. This will primarily be used for application development, primarily with Xcode. I'll also use it for photography/video (GIMP, and stepping into Aperture and Final Cut Express). I've ruled out an iMac because I want plenty of expansion options. I know Xcode scales linearly depending on the number of cores but I am trying to look for a sweet spot in performance and budget. I want something I can grow with for a few years (i.e 3-4). Currently I am suing a nearly full Macbook 2Ghz Core 2 Duo. I just built the latest nightly from Webkit and it took 1hr 9m, so I am definitely looking for an improvement. Any help/opinions you may have would be most welcome.