I'd be curious if you do an A/B with the Stellar. I was on the fence about ordering it, but since PS Audio's trial/return policy is so generous (in the US) I figured it was worth it.
I do disagree with @jmeyers on one point: My setup has a more modest turntable setup with basic blue jeans cables and even I could notice quite a difference. I think the Stellar could make any system sound better, not just with top-shelf components. That said, the additional upgrades certainly would help even more.