fadedorca66 makes a good point—don't go overboard or bury yourself in debt for a setup like this
Personally, I think the Phenom 945 is overpriced and closer to $50. You might snag one for $67, but getting an x3 720 for $33 is a steal. It’s only slightly slower, and honestly, just look at the numbers here
https://www.anandtech.com/bench/product/83?vs=80As for the cooler, if you're using the stock one, it isn't great. Usually, I'd suggest something like an LC 95 or similar for about $33
Having plenty of RAM is fine, but even 8GB will work perfectly for you. Especially since you can use an SSD as extra virtual memory for a fast page file—it'll be just as snappy as the RAM on your current PC... I'm not entirely sure if you need to tweak anything or if it's automatic, but usually, the page file kicks in automatically when you hit low RAM mode and a program needs more space
The most important thing is the SSD. Get that first, see how happy you are with the PC, and then maybe decide what else you want
Then look into a different CPU if you really feel the need
A solid power supply is also a good idea. A Fortron Hexsa 400W is around $100, but only grab that if you're satisfied with the build and think it can push through another few years