The ASR Basis Exclusive is a great phono preamp, IMHO. It is very neutral and very dynamic. Two of my friends use this unit, (and I wish I could afford it). Both use very low output MC cartridges, (one is the EMT cartridge with a 0.2mv output). Used the price is about $3,500, which is not too bad actually. Read the reviews by both Fremer, in Stereophile, as well as by HP in TAS.
It has an impressive list of features, including:
A. It is battery powered, and it automatically recharges the batteries when the unit is not in use.
B. When the unit senses that a signal is being sent from the cartridge, it automatically switches out the AC power, to run completely from batteries.
C. It is amazingly quiet.
D. It actually is two phono preamps in a single case, which allows two tonearms/turntables to be used.
E. It has both single ended and balanced inputs and outputs.
F. It has lots of different loading and gain settings, all easily changed with the flip of a dip switch.
Another good choice would be the Einstein Turntables Choice. (Available in either the single ended version, or the balanced version, although the later is basically just two single ended units with XLR terminations @ 50% more money). I've heard the balanced version, and it is very, very good. (Whether it is better or worse than the ASR Basis Exclusive is debatable, as both are top notch units.)
The Manley Steelhead is a hybrid phono preamp, which is highly regarded as well. (But it does have some tubes, but it is pretty darn quiet for a tubed unit.) It too has lots of features, including allowing two tonearms/turntables to be used at the flip of a switch, and it even has a set of analog inputs, and a volume control, which will allow the unit to be used as a preamp. (And the latest version has a remote control.) Note, this unit is available in single ended only configurations.
Good Luck in your search!