Speaker upgrade can be useful, when you go for a sensitive design (93dB+), you will get a more lively, much more effortless presentation with less resonance problems in the room. More important is the X-over, independent from the sensitivity from the chassis. Some can be a tough task for amps...
Phono Amp
Rolf Gmein (Symphonic Line) is a good Designer. A good Phono Stage is the key product for analog Reproduction. Each his own, but I always invested my most money in that stage, it is worth it. I used for a lot of years a Transistor unit from Stan Klyne (Model 7), not so common but he found some excellent solutions. Closed the gap between Transistor/Tube sound.
Good luck.
Phono Amp
Rolf Gmein (Symphonic Line) is a good Designer. A good Phono Stage is the key product for analog Reproduction. Each his own, but I always invested my most money in that stage, it is worth it. I used for a lot of years a Transistor unit from Stan Klyne (Model 7), not so common but he found some excellent solutions. Closed the gap between Transistor/Tube sound.
Good luck.