Looking for a change.

My current integrated amp is a 90 wpc Yamaha AS2100. I'm thinking about replacing it with a more powerful integrated, or keeping it as a pre and just adding an external amp. My speakers are Sonus Faber Cremona M with two KEF R400B subs. I have a Musical Fidelity Nu Vista Vinyl, so the phono stage is not an issue. The SF speakers are pretty efficient and good with this amp. Like everyone, I'm always wondering what could be. What am I missing with the Yamaha and what would I gain from making a change. I listen to vinyl on my VPI Prime with a Van den Hul MC DDT II Special. I stream with a Node running through the DAC of my Yamaha CD S2100. Is the Yamaha my weak link?