HI Artg: " Of the preamps You've mentioned. I've heard and recommended the First Sound Linestage (LS) One Mk.2 to about 3 friends, which ended up being owners. I've heard this Pre w/ Symphonic Line Rg 1 & 5's / Densen DM10 / Quicksilver Silver 60's / Audio Prism Debut MK.2 & Music Reference RM 9 MK. 2. And in each & every System....................., It JUST CLICKED. This is one of the best Preamps, I've ever listened too PERIOD. Clearly better then the Audible Illusions M3a's & Quicksilver preamps. Also more refined then any of the older Coounterpoints' , Audio Researchs' & Conrad-Johnsons', I've heard. If You have the opportunity too buy One..........., DON'T SLEEP. It's that good. ( Lots to offer, for the money.) The only place to go after this to my ears is still either a CAT SL-1 Ultimate ,or the Aesthetix Callisto or Calypso Linestages. I first heard this Preamp circa 1997. In a system that consisted of either a Cec TL ONE or Wadia WT 2000 CDTransports w/ Timbre Dac.MK 2 (wired w/ Nordort MoonGlo Digital Cable) & VTL 250 Monos' w/ Avalon Eclipse LS. Wired w/ Sonoran Cables. This was at a Friends home. In a room of about 18'W. x 27'L & 15'H. Needless to say, It's a sound in which I've never 4gotten."