I have an old Dell Dimension 8100 and need a new computer desperately. I am planning on the 20" iMac. I want to install Parallels 3.0 with XP Pro SP2, and MS-Office 2008 Enterprise Edition.
First, do you mean Office 2008 for
Mac (which wouldn't need Parallels) or Office 2007 for
Windows? What other Windows applications do you use heavily? Have you researched the Mac versions or equivalents of these applications? E.g. Mac Office 08 doesn't support macros (which may be irrelevant to you or a show stopper).
My feeling (feel free to disagree) is that there's no point getting a Mac unless you plan to switch to using Mac OS versions or equivalents (e.g. for office work, MS Office for Mac, Apple iWork or NeoOffice) of your most commonly used software.
What Parallels is ideal for is when you are almost ready to switch but there are one-or-two Windows applications that you sometimes need/are obliged to use - or you hit a broken Website that only works with IE. Don't get me wrong - Parallels is almost as good as having a "real" PC, lets you run windows and mac apps side-by-side and makes sharing data between the PC and Mac "sides" a breeze. That's excellent if you use Mac apps most of the time, but if you're going to spend 99% of your time running Windows apps in Parallels then its a rather round-about and expensive way of getting to "almost as good".
There's lots of good arguments for switching to Mac but those are off-topic for this forum.
Alternatively, if anything other than an iMac or MacBook is just too darned
ugly for you but you don't plan to use Mac apps, you could look at BootCamp which lets you run Windows directly on Mac hardware and gives better performance (but won't let you run Mac apps at the same time).