Hi there, This is more a hardware related questions, OS X doesn't play a big role: I have the chance to buy a Sun Ultra 40 for about 600$ (2x2.4 Opteron, 8 GB RAM, 500GB SATA HDD, Raid Controller, 8800 GTS) or for 1600$ a MacPro (2008 model, 2x2.66 DualCore Xeon, 3GB RAM, 250GB HDD). It'll be my private machine which I use for private software development (WPF/Silverlight) (so I'm not in an environment where even the time for compiling is money which can be saved ). Also I don't use it for playing games or similar. I tend to buy the Sun, add a Intel X25 SSD and maybe upgrade the Graphics Card. With that I'd still be under 1000$ and would have a decent workstation for development. For my OS X/XCode needs, I'd still have my Macbook Pro ;-) Am I missing something with the MacPro, where it has huge advantages over the Sun Workstation? Thanks for any input!