If you are going to achieve a significant improvement as has been claimed, I'd suggest there would have to something drastically wrong to get that level of benefit. At best you'd likely achieve a minor improvement.
Before you even considering upgrading, I'd recommend that all cables and interconnects should be the absolute best you can afford so you know are getting the best possible connection from the stylus, to each piece of equipment and finally onto your speakers.
I know some folk maintain cables are merely cables and digital is simply 0's and 1's. Ignore them for they are ignorant of the details.
VPI turntables
I currently have an Aries Scout with a Soundsmith Carmen 2 cartridge, I'm wondering if I'd hear any improvement going to a Prime with 3D arm or a Super Scout 21 with 10.5 arm or would more improvement be had by changing cartridges. I like the sound now but like most of us I'm always seeking improvement..
I'm using an Ayre phono pre into Pass XP10.
Thanks John