Should speakers be upgraded before preamp and amplifiers?

In the end, you gotta ask yourself, "do I want to be able to listen to my system for hours at a time and look forward to next time? The presentation of a loudspeaker and how it interacts with a specific person is the basis to evolve.

If your main source is vinyl try adding an inexpensive (but good) tube phono preamp through the Sansui.

Hagerman has one for $650 and Tubes4HiFi has one (built) for $400.

The Tubes4HiFi PH14 (I read here) is based upon the EAR 834P, which is a good thing if done right. 

Have you had the Sansui refurbished and do you use lead shot in the bases of the VR2's?

Wonder how many posting have heard a 9090DB?

DeKay

If possible, listen to different systems to define the sonic and physical attributes that work for you. Then narrow your search to components within your budget that have those attributes. You'll have your road map. I would go after the sources and el electronics. Then the speakers and the room will be the limiting factors. 

@daveoman 

We addressed speakers and amps, but after they’re sorted out, your turntable might be a sonic bottleneck. So agree with @dekay that an upgrading to a reasonably priced phono stage a great idea. 

Look at CRAIGLIST for JBL speakers