Well, there isn't always a perfect parallel. The easiest comparison is Mac vs PC though. If you take a Mac and build a PC with similar specs you can generally shave a fair sum off the price. There isn't always a parallel though; for example, the iPod Touch doesn't really have an even parallel because it's selling point is the app store.
As for the various brands of PCs, I wouldn't know on a whole -- I prefer to build my own.
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