Re: Is this a decent upgrade?
Sounds like a solid core system. But as you already know, the SSD and RAM are way too small. I ripped through 140Gb on my C drive within a couple weeks of upgrading (from scratch). 256Gb would be the minimum I'd recommend, but 500Gb would be safer and a better value. Anything more and you're looking at a big jump in price. You might be able to make 128Gb work by being extremely careful about where your programs load and store data, but I wouldn't recommend it.
8Gb of RAM might work for you depending on your specific needs. But if you use a high-end sample library (EastWest, for example), or lots of gourmet plug-ins, you'll likely find 8Gb inadequate.
)-|-( HeatherHaze http://heatherhaze.com/
"This will be our reply to violence: to make music more intensely, more beautifully, more devotedly than ever before." ~ Leonard Bernstein
Cakewalk by Bandlab
Studio One 3.5, Cubase 9.5
Intel Core i7 8700, 16Gb RAM
Focusrite Scarlett 18i20
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Windows 10 Professional 64-bit
...and a whole bunch of other stuff.