Upgrading from Supratek Pre to ?

I have a Supratek Syrah and I love it. I've had it for about five years, and it's provided nothing but stunning performance. I recently thought of upgrading the phono and I got a $3.5k Musical Fidelity KW phono stage, but while sounding different, it really wasn't better than the internal phono section of the Syrah. Hence, I sold it and am still using the Syrah.

I'm interested in hearing from folks who have had any of the Supratek preamps and have upgraded something they have found that sounds decidedly better. Anyone?