Successful ARC models

I have been using my ARC SP-15 preamp for about 9 years now. I am very pleased with it. The phono section has good bass and sweet highs and it has great flexibility with switchable impedance loading.

In 2004 I sent it back to ARC for a check-up and they recommended freshening it up by replacing all the electrolytic capacitors in the Power Supply section. I did and so I am good for at least another decade. It has always been a very reliable preamp.

I think an integrated phono section is better than a separate box, but I use the balanced outputs to my Amp and I sometimes think about trying a fully balanced preamp with my CD player just to hear the difference. But with one son in college and one in High School, that experiment will just have to wait.

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.