Between the faster processor and SSD, you'll see a big improvement. Get as much RAM as you can afford.
I recently built my own system, keeping the graphics card from my old one. Very similar specifications, but with not having to purchase a new graphics card (FirePro W5100) the rebuild cost only $1,300 or so. Premium stuff, too, including two Samsung 500GB SSDs (I think I already had one of those on hand), excellent power supply, and an 8-core 4GHz chip. I was also able to stick with Windows 7 Pro instead of pushing into Windows 10 (I'd like to delay that jump as long as I can for many, many reasons) with the hardware I chose.
Rendering, for instance, is about twice as fast as with my older T5500 Dell with six cores. Really amazing.
An SSD was one of the biggest upgrades we ever made, followed closely by going from 8 gig of ram to 16.
I have to do the installs at our company for all CAD and edrawings (shop/sales) pcs. I'd kill for them to install a small SSD on all the machines without one...