theres not any best preamp for LD mics. One thing you see with every audio community is that opinions are all over the place...LDs , are so different , sonically, from one mic to the next...one combination might sing and the next one suck. I love running my m930s and u87s through my pendulum, which is tube, and "warm" but I love how it sounds!..only you can be the judge of what sounds best to you.
or you could get a pre like this:
and switch back and forth between SS and Tube till you get what you want to hear.
dont worry, its DC Ready!
Teddy