SDS or phono stage


I have a VPI Scoutmaster with Soundsmith Zephyr Mk II cartridge, jmw memorial arm, a stainless steel vpi record clamp, playing through a Musial Fidelity KW500 integrated amp with on board phono stage. Sounds quite good, but my question is this: would I be better off at this point adding an SDS or an outboard phono stage? Or both? In what order? Thanks!
arsh
Brf-

I don't mean to hijack this thread but...

What is the SDS "run hours" feature? I bought my SDS used and did not know this feature existed.

How do you reset it? How do you "read" its results.

Thanks.
Never mind I found it.

Here it is:
http://vpiindustries.com/manuals/CALIBRATION_MODE_FOR%20_SDS.pdf
I spoke with Matt at VPI today, and he says it doesn't really matter how you do it. He says he has seen his father (Harry) leave it turned on for weeks at a time, using the tt motor switch. There is no harm in doing this, apparently.
So, I have the SDS and got a Herron VTPH-2 last week. The Herron is still breaking in, but already sounds excellent. So far so good!