"10-04-15: Rogerstillman
I just bought a pair of used Vandersteen 3A Signatures. I have them on my Krell (out of expediency) and love the bass, but I'm not getting a broad soundstage. Once I put my tube gear on that should change."
I have a pair of Model 3's myself. To get the soundstage you want, keep in mind that all of the components in the system, are equally responsible for this. You can have a bunch of great imaging pieces, but can still mess it up with just 1 poorly matched component. Also, tubes aren't required. The decision to buy a tube amp or preamp should be based on sound quality, not just because its a tube product. The best imaging I've heard from SS is Ayre. That's what I currently use on my 3's. When you are ready to upgrade, demo some Ayre products and see if they are for you.
When you get the speakers, follow the setup instruction listed in the manual. Its very important to do it this way if you want best sound. For cables, AQ Type 6 or Type 8 work very well with your speakers, and they are not expensive. Just make sure you double biwire with 2 separate runs of cable.