Wow... Thank you, to each and everyone who chimed in here with info, advice, comments and/or recommendations. I appreciate all of your comments.

Sorry, I forgot to mention that I am looking for Windows based system (although the Apple vs. Windows discussion was enlightening too...).

You all have pretty much widened my horizons ^ ^ and I now have a much better understanding of the meaning of these spec numbers I am looking at!

And that leaves me with just a few more questions:

1) Most systems I see in this price range are running Windows XP Home Edition. Can this be upgraded to Windows XP Professional? Installed or would I have to purchase upgrade software and do it myself? Does self installing of an upgrade change the benefit of the service agreement or warranty?

2) Is there a way to tell how RAM is installed if it is not speciffically mentioned in the specs? i.e., two 1 x 256K using two slots, or 1 x 512K in one slot? Affecting ability to upgrade RAM (in case I suddenly get the urge for heavy gaming?)

3) Would any of you consider buying a refurbished system (former top of the line model in its series)? Why or why not? If so, what would you expect in terms of warranty and/or service agmt etc.

4) Other than price, what are some of the factors you would consider in making the final decision; i.e., for example, what technical spec for you would be the deal maker?

Again, TIA for your participation here and your support.