backert vs sachs preamp

I've been using a passive preamp and was initially floored by its detail, but the novelty has worn off.  I've read every post on the active passive debate and agree with atmasphere's comment that the passive is actually coloring the sound.  So I'm going back to active - looking for the best of both worlds - transparency and dynamics. Based on my reading and conversations I have narrowed it down to 2 to audition, a backert or don sachs.  The backert I can audition but the sachs I may have to purchase and resell if I don't want it.  Does anyone have any experience with both of these preamps? I will be using it with quicksilver M60s. Thanks.  
thanks to all - I'll try to audition both - one thing I forgot to mention is I have only one source (a computer) - so I don't need multiple inputs - not sure if that would change anyone's recommendation -
I have no experience with Backert Labs gear so I have no views about them, but for me I have never heard a passive pre that I preferred over and active pre. 

I got the third or forth preamp that Don made and just a couple of months ago sent it back for what are likely the last interactions of enhancements he has employed in the preamp.  It is by far the finest pre that I have heard in my system in 45 or so years.  It is dead quiet in operation and has an immense soundstage owing to the design genius of 6SN7 octal tubes.  They inner detail of the instruments in uncannily realistic.  

I have had a relationship with Don for nearly a dozen years, going back to the upgrades he did on my HK Citation I, II, and V units.  His preamp is vastly better than the fully modded C-I and fair simpler in design.  His KT-88 amp is just as good and might give your QS amps a run for their money (I am going to do a comparison of the two very soon.)

I heartily recommend Don's preamp.  Every at 3X the its cost, I think it would a hard to find a preamp more musical.  I had to go through 15 or 20 preamps over the years before I discovered Don's preamp and now my search is over.  
Don Sachs preamp is a giant killer.  Their cost relative to their performance is tremendous.  Backer has modded equipment for me and he does good work.  Sachs preamp is for sure cheaper with out of this world performance.