Easy, at least if I were you. Your speakers: Sensitivity 90dB in 8 Ohms. We assume that is correct and that they are "amp friendly". 8 Ohm indicates that this may be the case. You are using a record player. Of course vintage amp. One then in good condition, to match the style. Doesn't need to have that many W's due to the sensitivity of the speakers.
Although it depends on other factors as well.
During my chat with the The Daily HiFi guys this past Monday, the topic of higher sensitivity speakers having more dynamic range came up. I gave my condensed spiel about why I think it isn't the speakers but rather the system as a whole that when integrating higher sensitivity speakers that...
audiosciencereview.com
When buying vintage check the condition, if it has been serviced well, if it has been refreshed with new electronic components, if that refresh is well done. Check that the transformer does not have an annoying mechanical humming sound. In addition to that, it's just a matter of going with vintage. Any recognized good vintage amp/receiver then.
I had also added subwoofers to those speakers. I would have put maybe 300 Euros on the amp and 700 Euros on the subwoofer, perhaps together with fixing a sensible EQ mainly for the subwoofers. But thats me. Maybe you don't think subwoofers would add anything meaningful to you?
Edit:
Who knows, in your case maybe a modest 30 W powered amp/receiver would work, for example one:
Yamaha CR-600
Attached picture test performed on one, not me who did that test.