I don't expect many to agree with me, but I have always preferred ARC's Power to it's Pre amps, or at least felt them to be better value. I have used the reference 75SE for some years now and never expect to change it. I looked around for some time for a Pre to do it justice, but couldn't really afford the Ref 5, which was available at the time, not the SE.
I tried the Ref 3 and yes it was very good, but found I preferred the sound of the Modwright 36.5 and it was cheaper. It seems to match the 75SE very well and again don't plan to change. So if like me, the 5SE and 6 are out of your price range, the Modwright might be worth a listen.