Do I upgrade my Cerwin Vegas S1's from the 70's

Yes, I am an old timer here. I moved from Marantz Quad solid state to a custom built Mcalister tube amp of 75 watts per channel and a Mcalister tube preamp. The even order harmonics from the tubes in compared to solid state was really picked up by my wife Theresa, who in the past would love listening for an hour or so and then ask me to turn it off-Funny thing, She does not ask me to turn it off any more-The tube amp provides such a live, realistic sound stage that is so pleasing to the ears that you cannot get enough of it.............So, that brings me to the speakers, and should I upgrade, and if I upgrade, what should I go to. I am a hobby cabinet maker, and I have considered full range speakers, whereby, I would make my own solid wood cabinets....... and from there, I would really appreciate any input