audible illusions vs supratek, vs holoaudio vs backert


starting to re-build a system and thought I'd start with some well known budget pre-amps that are supposed to punch above their weight.  i will be playing rock cd's only through atma-sphere m60's.  speakers and cd player are still TBD.  any thoughts/comparisons on these brands.  Obviously the supratek and holo are cheaper, but still wouldn't mind some overall feedback as I have never listened to any of them.

gwng8

@budburma -- member jslateiv is a stateside tech for Supratek, in North Carolina.

I sent my 20 yo Chenin in for a lookover and replace parts that might be due, cost around $500, highest recomend for Johnny's work,

I have owned the Audible Illusions pre and the Backert. The Backert is by far superior sounding.

I own the Backert and love it. No experience on the others you have listed.