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From the looks of it, you can only upgrade to 10.5 since you have a PowerPC processor and Snow Leopard is Intel only. Since most recent applications like Photoshop CS5, Office 2011, AutoCad, iLife '11, Firefox 4, Opera 11 requires you to have a Intel Processor to use their software, it maybe a better idea to get the new Intel Macs. In a few years, most software will be Intel only and it cannot run on PowerPC.
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