I just bought the Ram sticks Blueboozer posted the link for at Newegg. There $50 for 16GB total, not bad at all. (Thank you Blueboozer!

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I spent ~3 hours last night doing searches and reading on RAM.
And the sticks Blueboozer posted are the correct low voltage/dual voltage chips. Which seems to be more important than the speed.
I read last night that as long as you stay with the RAM series it's designed for/came with, mine's DDR3 series, not 4 or 2, you can use a faster RAM. The motherboard will just run it at what speed it can support.
I have a free program called Speccy that tells you what's in your computer and how it's running. Last night I clicked on the RAM usage % graph and it was using ~45% of the RAM, I opened a 2nd screen, it jumped to 65% usage and was slowly climbing.
I'll be looking to get a new desk top, but I'll still use this computer as long as I can after I get the 2nd computer. We have a raised ranch home, so 1 in the family room and the other in my music/work shop room downstairs.
My eye's are going with age and as I enlarge whats on the screen, it also pushes more and more off the screen.
So yesterday I also bought from Newegg, a 32" monitor. I won't have to enlarge everything and push it off the screen anymore, and....... It will be great for doing cad drawings for new builds.
I've gotten 15 years out of this Dell screen so far, so I got my money's worth. I really can't take this 21.5 screen anymore. A 27" would have helped but I went for the 32".
Thanks guys, I'll let you know how it goes when I get the RAM sticks in and the new screen hooked up.