What sonic improvements with a high end pre-amp


I've been considering "upgrading" my pre-amp but have been wondering what sonic improvements one might expect with a "higher end" pre-amp. That is, is this the area to upgrade or are other area's going to provide more substantial improvements. For some reference, my current system consists of Merlin VSM speakers, Quicksilver V4 mono amps, Audio Research SP14 pre that has been modified by GNSC, well tempered tt and ack DAC w/audio research CD player used as transport. Basically, I'm curious if upgrading to a dehavilland ultra verve, a supratek, or aesthix...would be a great move or should I look elsewhere. Thanks for any advice that may be forthcoming.
redcarerra
Generically, I believe some of the greatest gains can be found in locating the right amplifier, proper line conditioning, dedicated circuits/lines, speaker cables, ics, and proper vibration control.

However, in your specific case, I believe some of the greatest gains may be found in locating the right amplifier, proper line conditioning, dedicated circuits/lines, speaker cables, ics, and proper vibration control. :)

-IMO
Depends what you are trying to accomplish. Many would consider your SP14 to be on the cold side of neutral so if you're looking to warm up your system a pre-amp change could help. If you've voiced your system around the SP14 and you like it's tone then the added resolution from a pre-amp change would probably be nominal.
IMO, you would stand to gain more musicality and a better holographic soundstage. With the DeHavilland, the sonics you get are mostly controlled by one rolling just one 6SN7 tube to your preferrences. No risk if you take them up on their 30-day audition policy.

In the context of your system, I would also question the digital side. Perhaps a tubed front end will get you closer to your sonic goals.

JMHO!
the tube-rolling point is worth emphasizing: if you haven't played around with NOS in both your pre and power, you're missing out on potential huge sound differences. a tech guy once said to me that the sound of tube gear is mostly a factor of the transformers and the tubes you're using...