who are the best people to do equipment mods?

I have a question?

who are the best people/companies who do mods to existing equipment?

my personel experience is Rich Shultz at EVS who did a wonderful job with the Millenium II dac. A really wonderful and very musical piece. And Ric is a great guy but a bit swamped! I'll have him upgrade my system when I am ready for a universal transport!

Ric's website tweakaudio.com

I am currently looking at having Steve Huntley of GReat Northern SOunds do work on my ARC preamp and my transport. I heard great things about his Cal and ARC upgrades. Steve worked with Cal, Audio Research and Wadia and from what I hear he can take their pieces and make them sing even more musically. I'll let you know my findings

His website www.greatnorthernsound.com