Successful ARC models




I am looking for a used preamp with a price range to $ 2000 for active acoustics Genelec 1037.
Which ARC models are successful in this price range?
What to look for?
elgos
I am running a ls16mk2 with and have been very happy with the performance of this unit; I bought mine here on audiogon for 1500.00
and consider it to be well worth the price.
Sorry , I have forgotten to write that is wanted balanced preamp, because Genelec has a XLR input.

http://www.genelec.com/products/3-way-monitors/1037c/
If I have to choose among ARC LS5 MK2 , Sonic Frontiers Line 2 SE, Mark Levinson No. 380, Aesthetix Calypso , Accustic Arts Preamp1 Mark 3, which one is better and why?
Awaiting your response.
Thank you.