Aragon or Audio Research

I currently own an Aragon 8008 mk 2 amp and an Aragon 28k mk 2 preamp running single ended.  Just curious if an ARC LS17se preamp would be a big step up or soften the dynamics/bottom end a bit.  Any experience?

Thank you.     
If you like what you have don't change. If you can borrow a tube unit and see if you like it better. Tube and SS sound different and you will probably like one or the other. I have some of each and they do not sound the same. I now use passive but is another story