My thanks to everyone who has given me advice. I still haven't purchased one yet, but am getting very close.

I was going to go with the Dell, until I started getting feedback from all of you. My present computer was "built" and I was able to up-grade it over the years to its present state. So if I want the new one to do the same, I think I will get it built, as well. And thanks to all of you, I think I now know what components to get.

Now I just have to find someone to build it for me....
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"Not everything that counts can be counted, and not everything that can be counted counts." (Sign hanging in Einstein's office at Princeton)