I put paying big bucks for vinyl low on the list, these days. That isn't the way the wind is blowing. And even though 45's can sound better, spending even more time cleaning and turning records over is not very appealing. And then there's the problems with the mastering of many reissues, which can make the records hit-or-miss.
The source quality is often the least of my concerns, since I like many historical recordings and bootlegs of live recordings, where the quality of the recording is poor.
Since you express happiness with your current speakers: a better integrated will make every single thing you listen to sound better. Including all the records you already have.