Music reference/ audio research / vpi

Congrats. Your RM with the 40's should be a stellar combo.
I have had an Aesthetix Calypso and enjoyed it until a friend asked me if the residual noise from it bothered me? I didn't understand his question until he brought over his pre to replace it for an audition. Then I heard what he was referring to. Once heard it is easy to pick out and I was no longer able to keep it in my system and immediately replaced it.  I'm not sure if this is present in the signature models but it has been repeatedly heard in several std models. I have been questioned about the tubes that I was using. I have a VERY large collection of tubes and changing the tubes did not correct the problem.
While your results may be different, I would encourage an in home audition before purchasing one. I feel that for the same money there are much better pre's out there.
Keep us posted on your thought on the 40's.

fanotunes,
I guess you picked up the nice pair of 40.1's recently listed for $6,700?  If so, you got a great deal on those puppies!  I think you will be amazed how organic and natural they sound.  I've heard other's refer to Harbeth's 40 series as their "desert island" speaker... as in if they had to pick one speaker to have if stranded on a desert island for life, the big Harbeth's are what they'd choose.

I'd stick with a neutral preamp and experiment with other tube amps over time to figure out what suits you... or even better, keep your RM 200 and buy a second more tubey sounding amp to have as a alternative when the mood strikes you to change things up.  This is what I do.  There are many great tube amps in the $2,000 to $4,000 range, including the two that I currently own. 

Thank you, pdreher. for your suggestions/feed back. Swapping out the KT-88’s might be an option too? And still thinking the Audio research reference 5SE or 6, with a reference phono 3 would be a nice preamp for me here.  I may have to wait for the prices on those come down a bit though! Regards!

I'd use RAM KT88's and maybe play with some NOS signal tubes, then upgrade your preamp to something from CAT, Aesthetix or go up the Audio Research food chain.