Successful ARC models

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/

I am looking new for an Audio Research LS-5 MkII.
Whats the opinion on ?

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.