Thanks for the advice and suggestions. I decided to take it over to a computer guy I've used a couple of times before when I needed work on my MacBook Pro. After we talked about the various possibilities, he offered to sell me a refurbished unit he had in his shop. It's a Lenovo Think Center Core i5, 16 GB Ram, 240 GBSSD, graphics card for 3 monitors, and Vipre Life Anti-Virus. He cloned my existing Hard drive over to the new one, plus he upgraded MS Office for me. So after a wait of about 4 hours or so, I brought the setup back to my office, plugged it in, and am back up & running. Total cost was $590.
I still have the original Hard Drive and a SATA/IDE self-powered cable, so if it turns out anything is missing I can (hopefully) pull ot off the original HD.
Glad to get this done before tax filing season rolls around.