ARC or Jeff Rowland pre-amp?

I’m using Electrocompaniet EC-4.8 Pre-amp and AW-180 Mono-block power-amp about 5 to 6 years, I enjoy EC amp sound very much but recently want to try something new. I used listen to Mark Levinson No. 326S, Accuphase and several famous brands but they are not impressed me very much. Because I’m using Esoteric K-03X and Avalon Opus Ceramique speaker,  I know many Avalon speaker user are using JR and ARC pre-amp, and I heard a lot of good things about these amp , so I’m interest to give them a try, my target is ARC’s Ref 6 and JR’s Corus. Unfortunately I’m unable to compare them side by side at the same place because they have different distributor in my area.

I prefer natural, a little bit warm and sweat sound, not too fast but not slow, very good density and texture, good dynamic, wide soundstage, very high transparency and very good 3D dimension soundstage. I only listen to Jazz music, especially contemporary Jazz like Charlie Haden, Stan Getz, Bossa Nova, Pat Menthey, Enrico Pieranunzi…. which pre-amp you think is fit for my need?

Another important very thing is I will not change my EC AW-180 Mono-block power amp at this stage because no budget (And this power-amp drive My OPS Ceramique very well). So I need to know which pre-amp can work better with my power-amp?  THX!