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So humor me again. If I add enough memory, enough Hard drive disk space, and etc., I will not ever need to purchase a pc again if I get a Mac Pro.
I would say this is erroneous thinking. First off, a Mac
"IS" a PC (as in Personal Computer). It's just made by a company called Apple and runs an OS that those other mass produced PC's do not.
It is still made up of the same parts; a case, power supply, motherboard/systemboard, processor, video card, sound card, NIC, hard drive, optical drive, etc...
All of these components can and do fail whether manufactured by Apple, Dell, HP, Alienware or ...
There are problems and issues with every OS, whether OS X, Windows or Linux. You're likely to find
something that does not work to suit you no matter which one of them you put on a computer.
Having the thought that you'll
"not ever" need to purchase a PC again, well, that just tells me you haven't been purchasing computers for very long and are not old enough to have watched the advances in home computers over the last 30 years.
In the mid to late 90's, not a single 12 month old computer could play the latest game that came out without requiring anything from a new video card to all new hardware or an upgrade to the newest OS.
Due to issues surrounding keeping chipsets cooled that still have not been solved, this has slowed way down. Today, there are 5 year old computers that you can install the newest OS, the newest pieces of software and some of the newest hardware. There certainly are not any 10 year old computers you can do this with. Whether that will still be the case 8-10 years from now... I don't know whether the technology will slow down that much or not. But, I certainly wouldn't count on it.
Having said all that, I really like my Mac. Although I take issue with some things, I like OS X. Many others do also. Many do not. My MBP has not moved into being the best computer I've ever had (yet). That particular title in my house is held by the last P4 system with XP that I built (and just sold 2 weeks ago). I would caution having a "realistic" expectation of what you are purchasing when buying any computer and not be caught up in the 'fanboyism' and/or emotions that overcome some.