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
If you use the SDS’s on/off to control the motor, you can use the VPI SDS “run hours” feature to monitor cartridge use.

I've had a SDS in continuous use for 10+ years using the on/off switch w/o any problems.
I use the on/off button on the TT as I find it more convenient to use. I spoke with VPI and they told me that there was no problem doing it that way. VPI says not to have the SDS too close to the TT. When I had it about six inches away it created some hum. I have them about three feet apart now and no hum at all. I have a newer Classic 3 with the motor in the rear which is a pain to change the belt. The SDS makes changing from 33 1/3 to 45 easy with the push of a button.
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